Merge pull request #876 from Akarinnnnn/fix-872

Fix #872 by reserve null title string.

.github/workflows/ci.yml

@@ -11,22 +11,11 @@ on:
 
 jobs:
   build:
-    runs-on: windows-latest
-
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v2
-      with:
-        submodules: true
-        fetch-depth: 0
-
-    - name: Install .NET 6.0
-      uses: actions/setup-dotnet@v1
-      with:
-        dotnet-version: '6.0.x'
-
-    - name: Build, Test, Pack, Publish
-      shell: bash
-      run: |
-        dotnet tool install -g dotnet-releaser
-        dotnet-releaser run --nuget-token "${{secrets.NUGET_TOKEN}}" --github-token "${{secrets.GITHUB_TOKEN}}" src/dotnet-releaser.toml
+    uses: xoofx/.github/.github/workflows/dotnet.yml@main
+    with:
+      dotnet-version: |
+        6.0
+        8.0
+        9.0
+    secrets:
+      NUGET_TOKEN: ${{ secrets.NUGET_TOKEN }}    

.github/workflows/nuget_org_only.config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <clear />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
+  </packageSources>
+</configuration>

contributing.md

@@ -0,0 +1,36 @@
+# How to Contribute
+
+Thanks for your interest in contributing to `Markdig`! Here are a few general guidelines on contributing and
+reporting bugs that we ask you to review. Following these guidelines helps to communicate that you respect the time of
+the contributors managing and developing this open source project.
+
+## Reporting Issues
+
+Before reporting a new issue, please ensure that the issue was not already reported or fixed by searching through our
+[issues list](https://github.com/xoofx/markdig/issues).
+
+When creating a new issue, please be sure to include a **title and clear description**, as much relevant information as
+possible, and, if possible, a test case.
+
+## Sending Pull Requests
+
+Before sending a new pull request, take a look at existing pull requests and issues to see if the proposed change or fix
+has been discussed in the past, or if the change was already implemented but not yet released.
+
+We expect new pull requests to include tests for any affected behavior, and, as we follow semantic versioning, we may
+reserve breaking changes until the next major version release.
+
+## Other Ways to Contribute
+
+We welcome anyone that wants to contribute to `Markdig` to triage and reply to open issues to help troubleshoot
+and fix existing bugs. Here is what you can do:
+
+- Help ensure that existing issues follows the recommendations from the _[Reporting Issues](#reporting-issues)_ section,
+  providing feedback to the issue's author on what might be missing.
+  instructions and code samples.
+- Review existing pull requests, and testing patches against real existing applications that use `Markdig`.
+- Write a test, or add a missing test case to an existing test.
+
+Thanks again for your interest on contributing to `Markdig`!
+
+:heart:

doc/parsing-extensions.md

@@ -1,6 +1,6 @@
 # Extensions and Parsers
 
-Markdig was [implemented in such a way](http://xoofx.com/blog/2016/06/13/implementing-a-markdown-processor-for-dotnet/) as to be extremely pluggable, with even basic behaviors being mutable and extendable.
+Markdig was [implemented in such a way](http://xoofx.github.io/blog/2016/06/13/implementing-a-markdown-processor-for-dotnet/) as to be extremely pluggable, with even basic behaviors being mutable and extendable.
 
 The basic mechanism for extension of Markdig is the `IMarkdownExtension` interface, which allows any implementing class to be registered with the pipeline builder and thus to directly modify the collections of `BlockParser` and `InlineParser` objects which end up in the pipeline.
 

readme.md

@@ -1,4 +1,4 @@
-# Markdig [![Build Status](https://github.com/lunet-io/markdig/workflows/ci/badge.svg?branch=master)](https://github.com/lunet-io/markdig/actions) [![Coverage Status](https://coveralls.io/repos/github/xoofx/markdig/badge.svg?branch=master)](https://coveralls.io/github/xoofx/markdig?branch=master) [![NuGet](https://img.shields.io/nuget/v/Markdig.svg)](https://www.nuget.org/packages/Markdig/) [![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donate_SM.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=FRGHXBTP442JL)
+# Markdig [![ci](https://github.com/xoofx/markdig/actions/workflows/ci.yml/badge.svg)](https://github.com/xoofx/markdig/actions/workflows/ci.yml) [![Coverage Status](https://coveralls.io/repos/github/xoofx/markdig/badge.svg?branch=master)](https://coveralls.io/github/xoofx/markdig?branch=master) [![NuGet](https://img.shields.io/nuget/v/Markdig.svg)](https://www.nuget.org/packages/Markdig/) [![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donate_SM.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=FRGHXBTP442JL)
 
 <img align="right" width="160px" height="160px" src="img/markdig.png">
 
@@ -12,9 +12,9 @@ You can **try Markdig online** and compare it to other implementations on [babel
 
 - **Very fast parser and html renderer** (no-regexp), very lightweight in terms of GC pressure. See benchmarks
 - **Abstract Syntax Tree** with precise source code location for syntax tree, useful when building a Markdown editor.
-  - Checkout [MarkdownEditor for Visual Studio](https://visualstudiogallery.msdn.microsoft.com/eaab33c3-437b-4918-8354-872dfe5d1bfe) powered by Markdig!
+  - Checkout [Markdown Editor v2 for Visual Studio 2022](https://marketplace.visualstudio.com/items?itemName=MadsKristensen.MarkdownEditor2) powered by Markdig!
 - Converter to **HTML**
-- Passing more than **600+ tests** from the latest [CommonMark specs (0.30)](http://spec.commonmark.org/)
+- Passing more than **600+ tests** from the latest [CommonMark specs (0.31.2)](http://spec.commonmark.org/)
 - Includes all the core elements of CommonMark:
   - including **GFM fenced code blocks**.  
 - **Extensible** architecture
@@ -48,7 +48,7 @@ You can **try Markdig online** and compare it to other implementations on [babel
   - [**Emoji**](src/Markdig.Tests/Specs/EmojiSpecs.md) support (inspired from [Markdown-it](https://markdown-it.github.io/))
   - [**SmartyPants**](src/Markdig.Tests/Specs/SmartyPantsSpecs.md) (inspired from [Daring Fireball - SmartyPants](https://daringfireball.net/projects/smartypants/))
   - [**Bootstrap**](src/Markdig.Tests/Specs/BootstrapSpecs.md) class (to output bootstrap class)
-  - [**Diagrams**](src/Markdig.Tests/Specs/DiagramsSpecs.md) extension whenever a fenced code block contains a special keyword, it will be converted to a div block with the content as-is (currently, supports [`mermaid`](https://knsv.github.io/mermaid/) and [`nomnoml`](https://github.com/skanaar/nomnoml) diagrams)
+  - [**Diagrams**](src/Markdig.Tests/Specs/DiagramsSpecs.md) extension whenever a fenced code block contains a special keyword, it will be converted to a div block with the content as-is (currently, supports [`mermaid`](https://mermaid.js.org) and [`nomnoml`](https://github.com/skanaar/nomnoml) diagrams)
   - [**YAML Front Matter**](src/Markdig.Tests/Specs/YamlSpecs.md) to parse without evaluating the front matter and to discard it from the HTML output (typically used for previewing without the front matter in MarkdownEditor)
   - [**JIRA links**](src/Markdig.Tests/Specs/JiraLinks.md) to automatically generate links for JIRA project references (Thanks to @clarkd: https://github.com/clarkd/MarkdigJiraLinker)
 - Starting with Markdig version `0.20.0+`, Markdig is compatible only with `NETStandard 2.0`, `NETStandard 2.1`, `NETCoreApp 2.1` and `NETCoreApp 3.1`.
@@ -70,7 +70,7 @@ If you are looking for support for an old .NET Framework 3.5 or 4.0, you can dow
 
 While there is not yet a dedicated documentation, you can find from the [specs documentation](src/Markdig.Tests/Specs/readme.md) how to use these extensions.
 
-In the meantime, you can have a "behind the scene" article about Markdig in my blog post ["Implementing a Markdown Engine for .NET"](http://xoofx.com/blog/2016/06/13/implementing-a-markdown-processor-for-dotnet/)
+In the meantime, you can have a "behind the scene" article about Markdig in my blog post ["Implementing a Markdown Engine for .NET"](http://xoofx.github.io/blog/2016/06/13/implementing-a-markdown-processor-for-dotnet/)
 
 ## Download
 
@@ -101,6 +101,10 @@ var result = Markdown.ToHtml("This is a text with some *emphasis*", pipeline);
 
 You can have a look at the [MarkdownExtensions](https://github.com/lunet-io/markdig/blob/master/src/Markdig/MarkdownExtensions.cs) that describes all actionable extensions (by modifying the MarkdownPipeline)
 
+## Contributing
+
+Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated. For detailed contributing guidelines, please see [contributing.md](contributing.md).
+
 ## Build
 
 In order to build Markdig, you need to install [.NET 6.0](https://dotnet.microsoft.com/en-us/download)
@@ -140,12 +144,12 @@ AMD Ryzen 9 5950X, 1 CPU, 32 logical and 16 physical cores
 - Markdig is roughly **x100 times faster than MarkdownSharp**
 - **20% faster than the reference cmark C implementation** 
 
+## Sponsors
 
-## Donate
+Supports this project with a monthly donation and help me continue improving it. \[[Become a sponsor](https://github.com/sponsors/xoofx)\]
 
-If you are using this library and find it useful for your project, please consider a donation for it!
-
-[![Donate](https://www.paypalobjects.com/en_US/i/btn/btn_donate_SM.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=FRGHXBTP442JL)
+[<img src="https://github.com/lilith.png?size=200" width="64px;" style="border-radius: 50%" alt="lilith"/>](https://github.com/lilith) Lilith River, author of [Imageflow Server, an easy on-demand
+image editing, optimization, and delivery server](https://github.com/imazen/imageflow-server)
 
 ## Credits
 
@@ -160,4 +164,4 @@ Some decoding part (e.g HTML [EntityHelper.cs](https://github.com/lunet-io/markd
 Thanks to the work done by @clarkd on the JIRA Link extension (https://github.com/clarkd/MarkdigJiraLinker), now included with this project!
 ## Author
 
-Alexandre MUTEL aka [xoofx](http://xoofx.com)
+Alexandre MUTEL aka [xoofx](http://xoofx.github.io)

src/Markdig.Benchmarks/CommonMarkLib.cs

@@ -1,40 +1,38 @@
-// Copyright (c) Alexandre Mutel. All rights reserved.
+// Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
 
-using System;
 using System.Runtime.InteropServices;
 using System.Text;
 
-namespace Testamina.Markdig.Benchmarks
-{
-    public static class CommonMarkLib
-    {
-        public static string ToHtml(string text)
-        {
-            unsafe
-            {
-                var textAsArray = Encoding.UTF8.GetBytes(text);
+namespace Testamina.Markdig.Benchmarks;
 
-                fixed (void* ptext = textAsArray)
+public static class CommonMarkLib
+{
+    public static string ToHtml(string text)
+    {
+        unsafe
+        {
+            var textAsArray = Encoding.UTF8.GetBytes(text);
+
+            fixed (void* ptext = textAsArray)
+            {
+                var ptr = (byte*)cmark_markdown_to_html(new IntPtr(ptext), text.Length);
+                int length = 0;
+                while (ptr[length] != 0)
                 {
-                    var ptr = (byte*)cmark_markdown_to_html(new IntPtr(ptext), text.Length);
-                    int length = 0;
-                    while (ptr[length] != 0)
-                    {
-                        length++;
-                    }
-                    var buffer = new byte[length];
-                    Marshal.Copy(new IntPtr(ptr), buffer, 0, length);
-                    var result = Encoding.UTF8.GetString(buffer);
-                    Marshal.FreeHGlobal(new IntPtr(ptr));
-                    return result;
+                    length++;
                 }
+                var buffer = new byte[length];
+                Marshal.Copy(new IntPtr(ptr), buffer, 0, length);
+                var result = Encoding.UTF8.GetString(buffer);
+                Marshal.FreeHGlobal(new IntPtr(ptr));
+                return result;
             }
         }
-
-        // char *cmark_markdown_to_html(const char *text, size_t len, int options);
-        [DllImport("cmark", CallingConvention = CallingConvention.Cdecl)]
-        private static extern IntPtr cmark_markdown_to_html(IntPtr charBuffer, int len, int options = 0);
     }
+
+    // char *cmark_markdown_to_html(const char *text, size_t len, int options);
+    [DllImport("cmark", CallingConvention = CallingConvention.Cdecl)]
+    private static extern IntPtr cmark_markdown_to_html(IntPtr charBuffer, int len, int options = 0);
 }

src/Markdig.Benchmarks/Markdig.Benchmarks.csproj

@@ -1,9 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <OutputType>Exe</OutputType>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <IsPackable>false</IsPackable>
+    <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
   <ItemGroup>
     <None Remove="spec.md" />
@@ -18,12 +19,12 @@
     </Content>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.13.1" />
-    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.13.1" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.14.0" />
+    <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.14.0" />
     <PackageReference Include="CommonMark.NET" Version="0.15.1" />
     <PackageReference Include="Markdown" Version="2.2.1" />
     <PackageReference Include="MarkdownSharp" Version="2.0.5" />
-    <PackageReference Include="Microsoft.Diagnostics.Runtime" Version="2.0.226801" />
+    <PackageReference Include="Microsoft.Diagnostics.Runtime" Version="3.1.512801" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Markdig\Markdig.csproj" />

src/Markdig.Benchmarks/Program.cs

@@ -2,76 +2,75 @@
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
 
-using System.IO;
 using BenchmarkDotNet.Attributes;
 using BenchmarkDotNet.Configs;
 using BenchmarkDotNet.Running;
+
 using Markdig;
 
 
-namespace Testamina.Markdig.Benchmarks
+namespace Testamina.Markdig.Benchmarks;
+
+//[BenchmarkTask(platform: BenchmarkPlatform.X64, jitVersion: BenchmarkJitVersion.RyuJit, processCount: 1, warmupIterationCount: 2)]
+public class Program
 {
-    //[BenchmarkTask(platform: BenchmarkPlatform.X64, jitVersion: BenchmarkJitVersion.RyuJit, processCount: 1, warmupIterationCount: 2)]
-    public class Program
+    private string text;
+
+    public Program()
     {
-        private string text;
+        //text = File.ReadAllText("progit.md");
+        text = File.ReadAllText("spec.md");
+    }
 
-        public Program()
-        {
-            //text = File.ReadAllText("progit.md");
-            text = File.ReadAllText("spec.md");
-        }
+    //[Benchmark(Description = "TestMarkdig", OperationsPerInvoke = 4096)]
+    [Benchmark(Description = "markdig")]
+    public void TestMarkdig()
+    {
+        //var reader = new StreamReader(File.Open("spec.md", FileMode.Open));
+        Markdown.ToHtml(text);
+        //File.WriteAllText("spec.html", writer.ToString());
+    }
 
-        //[Benchmark(Description = "TestMarkdig", OperationsPerInvoke = 4096)]
-        [Benchmark(Description = "markdig")]
-        public void TestMarkdig()
-        {
-            //var reader = new StreamReader(File.Open("spec.md", FileMode.Open));
-            Markdown.ToHtml(text);
-            //File.WriteAllText("spec.html", writer.ToString());
-        }
+    [Benchmark(Description = "cmark")]
+    public void TestCommonMarkCpp()
+    {
+        //var reader = new StreamReader(File.Open("spec.md", FileMode.Open));
+        CommonMarkLib.ToHtml(text);
+        //File.WriteAllText("spec.html", writer.ToString());
+    }
 
-        [Benchmark(Description = "cmark")]
-        public void TestCommonMarkCpp()
-        {
-            //var reader = new StreamReader(File.Open("spec.md", FileMode.Open));
-            CommonMarkLib.ToHtml(text);
-            //File.WriteAllText("spec.html", writer.ToString());
-        }
+    [Benchmark(Description = "CommonMark.NET")]
+    public void TestCommonMarkNet()
+    {
+        ////var reader = new StreamReader(File.Open("spec.md", FileMode.Open));
+        // var reader = new StringReader(text);
+        //CommonMark.CommonMarkConverter.Parse(reader);
+        //CommonMark.CommonMarkConverter.Parse(reader);
+        //reader.Dispose();
+        //var writer = new StringWriter();
+        CommonMark.CommonMarkConverter.Convert(text);
+        //writer.Flush();
+        //writer.ToString();
+    }
 
-        [Benchmark(Description = "CommonMark.NET")]
-        public void TestCommonMarkNet()
-        {
-            ////var reader = new StreamReader(File.Open("spec.md", FileMode.Open));
-            // var reader = new StringReader(text);
-            //CommonMark.CommonMarkConverter.Parse(reader);
-            //CommonMark.CommonMarkConverter.Parse(reader);
-            //reader.Dispose();
-            //var writer = new StringWriter();
-            CommonMark.CommonMarkConverter.Convert(text);
-            //writer.Flush();
-            //writer.ToString();
-        }
+    [Benchmark(Description = "MarkdownSharp")]
+    public void TestMarkdownSharp()
+    {
+        new MarkdownSharp.Markdown().Transform(text);
+    }
 
-        [Benchmark(Description = "MarkdownSharp")]
-        public void TestMarkdownSharp()
-        {
-            new MarkdownSharp.Markdown().Transform(text);
-        }
+    static void Main(string[] args)
+    {
+        var config = ManualConfig.Create(DefaultConfig.Instance);
+        //var gcDiagnoser = new MemoryDiagnoser();
+        //config.Add(new Job { Mode = Mode.SingleRun, LaunchCount = 2, WarmupCount = 2, IterationTime = 1024, TargetCount = 10 });
+        //config.Add(new Job { Mode = Mode.Throughput, LaunchCount = 2, WarmupCount = 2, TargetCount = 10 });
+        //config.Add(gcDiagnoser);
 
-        static void Main(string[] args)
-        {
-            var config = ManualConfig.Create(DefaultConfig.Instance);
-            //var gcDiagnoser = new MemoryDiagnoser();
-            //config.Add(new Job { Mode = Mode.SingleRun, LaunchCount = 2, WarmupCount = 2, IterationTime = 1024, TargetCount = 10 });
-            //config.Add(new Job { Mode = Mode.Throughput, LaunchCount = 2, WarmupCount = 2, TargetCount = 10 });
-            //config.Add(gcDiagnoser);
-
-            //var  config = DefaultConfig.Instance;
-            BenchmarkRunner.Run<Program>(config);
-            //BenchmarkRunner.Run<TestDictionary>(config);
-            //BenchmarkRunner.Run<TestMatchPerf>();
-            //BenchmarkRunner.Run<TestStringPerf>();
-        }
+        //var  config = DefaultConfig.Instance;
+        BenchmarkRunner.Run<Program>(config);
+        //BenchmarkRunner.Run<TestDictionary>(config);
+        //BenchmarkRunner.Run<TestMatchPerf>();
+        //BenchmarkRunner.Run<TestStringPerf>();
     }
 }

src/Markdig.Benchmarks/TestMatchPerf.cs

@@ -2,81 +2,79 @@
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
 
-using System.Collections.Generic;
 using System.Text;
 using System.Text.RegularExpressions;
 
-namespace Testamina.Markdig.Benchmarks
+namespace Testamina.Markdig.Benchmarks;
+
+public class TextRegexHelper
 {
-    public class TextRegexHelper
+    private readonly Dictionary<string, string> replacers;
+    private readonly Regex regex;
+
+    public TextRegexHelper(Dictionary<string, string> replacers)
     {
-        private readonly Dictionary<string, string> replacers;
-        private readonly Regex regex;
+        this.replacers = replacers;
+        var builder = new StringBuilder();
 
-        public TextRegexHelper(Dictionary<string, string> replacers)
+        // (?<1>:value:?)|(?<1>:noo:?)
+        foreach (var replace in replacers)
         {
-            this.replacers = replacers;
-            var builder = new StringBuilder();
-
-            // (?<1>:value:?)|(?<1>:noo:?)
-            foreach (var replace in replacers)
+            var matchStr = Regex.Escape(replace.Key);
+            if (builder.Length > 0)
             {
-                var matchStr = Regex.Escape(replace.Key);
-                if (builder.Length > 0)
-                {
-                    builder.Append('|');
-                }
-                builder.Append("(?<1>").Append(matchStr).Append("?)");
+                builder.Append('|');
             }
-
-            regex = new Regex(builder.ToString());
+            builder.Append("(?<1>").Append(matchStr).Append("?)");
         }
 
-        public bool TryMatch(string text, int offset, out string matchText, out string replaceText)
-        {
-            replaceText = null;
-            matchText = null;
-            var result = regex.Match(text, offset);
-            if (!result.Success)
-            {
-                return false;
-            }
-
-            matchText = result.Groups[1].Value;
-            replaceText = replacers[matchText];
-            return true;
-        }
+        regex = new Regex(builder.ToString());
     }
 
-    /*
-    public class TestMatchPerf
+    public bool TryMatch(string text, int offset, out string matchText, out string replaceText)
     {
-        private readonly TextMatchHelper matcher;
-
-        public TestMatchPerf()
+        replaceText = null;
+        matchText = null;
+        var result = regex.Match(text, offset);
+        if (!result.Success)
         {
-            var replacers = new Dictionary<string, string>();
-            for (int i = 0; i < 1000; i++)
-            {
-                replacers.Add($":z{i}:", i.ToString());
-            }
-            replacers.Add(":abc:", "yes");
-
-            matcher = new TextMatchHelper(new HashSet<string>(replacers.Keys));
+            return false;
         }
 
-        [Benchmark]
-        public void TestMatch()
-        {
+        matchText = result.Groups[1].Value;
+        replaceText = replacers[matchText];
+        return true;
+    }
+}
 
-            for (int i = 0; i < 1000; i++)
-            {
-                string matchText;
-                //var text = ":z150: this is a long string";
-                var text = ":z1:";
-                matcher.TryMatch(text, 0, text.Length, out matchText);
-            }
+/*
+public class TestMatchPerf
+{
+    private readonly TextMatchHelper matcher;
+
+    public TestMatchPerf()
+    {
+        var replacers = new Dictionary<string, string>();
+        for (int i = 0; i < 1000; i++)
+        {
+            replacers.Add($":z{i}:", i.ToString());
+        }
+        replacers.Add(":abc:", "yes");
+
+        matcher = new TextMatchHelper(new HashSet<string>(replacers.Keys));
+    }
+
+    [Benchmark]
+    public void TestMatch()
+    {
+
+        for (int i = 0; i < 1000; i++)
+        {
+            string matchText;
+            //var text = ":z150: this is a long string";
+            var text = ":z1:";
+            matcher.TryMatch(text, 0, text.Length, out matchText);
         }
     }
-    */
-}
+}
+*/

src/Markdig.Benchmarks/TestStringPerf.cs

@@ -1,58 +1,57 @@
-using System.IO;
 using BenchmarkDotNet.Attributes;
+
 using Markdig.Renderers;
 
-namespace Testamina.Markdig.Benchmarks
+namespace Testamina.Markdig.Benchmarks;
+
+public class TestStringPerf
 {
-    public class TestStringPerf
+    private string text;
+
+    public TestStringPerf()
     {
-        private string text;
-
-        public TestStringPerf()
-        {
-            text = new string('a', 1000);
-        }
-
-        [Benchmark]
-        public void TestIndexOfAny()
-        {
-            var writer = new HtmlRenderer(new StringWriter());
-            for (int i = 0; i < 100; i++)
-            {
-                writer.WriteEscape(text, 0, text.Length);
-                writer.WriteEscape(text, 0, text.Length);
-                writer.WriteEscape(text, 0, text.Length);
-                writer.WriteEscape(text, 0, text.Length);
-                writer.WriteEscape(text, 0, text.Length);
-
-                writer.WriteEscape(text, 0, text.Length);
-                writer.WriteEscape(text, 0, text.Length);
-                writer.WriteEscape(text, 0, text.Length);
-                writer.WriteEscape(text, 0, text.Length);
-                writer.WriteEscape(text, 0, text.Length);
-            }
-        }
-
-
-        //[Benchmark]
-        //public void TestCustomIndexOfAny()
-        //{
-        //    var writer = new HtmlRenderer(new StringWriter());
-        //    for (int i = 0; i < 100; i++)
-        //    {
-        //        writer.WriteEscapeOptimized(text, 0, text.Length);
-        //        writer.WriteEscapeOptimized(text, 0, text.Length);
-        //        writer.WriteEscapeOptimized(text, 0, text.Length);
-        //        writer.WriteEscapeOptimized(text, 0, text.Length);
-        //        writer.WriteEscapeOptimized(text, 0, text.Length);
-
-        //        writer.WriteEscapeOptimized(text, 0, text.Length);
-        //        writer.WriteEscapeOptimized(text, 0, text.Length);
-        //        writer.WriteEscapeOptimized(text, 0, text.Length);
-        //        writer.WriteEscapeOptimized(text, 0, text.Length);
-        //        writer.WriteEscapeOptimized(text, 0, text.Length);
-        //    }
-        //}
-
+        text = new string('a', 1000);
     }
+
+    [Benchmark]
+    public void TestIndexOfAny()
+    {
+        var writer = new HtmlRenderer(new StringWriter());
+        for (int i = 0; i < 100; i++)
+        {
+            writer.WriteEscape(text, 0, text.Length);
+            writer.WriteEscape(text, 0, text.Length);
+            writer.WriteEscape(text, 0, text.Length);
+            writer.WriteEscape(text, 0, text.Length);
+            writer.WriteEscape(text, 0, text.Length);
+
+            writer.WriteEscape(text, 0, text.Length);
+            writer.WriteEscape(text, 0, text.Length);
+            writer.WriteEscape(text, 0, text.Length);
+            writer.WriteEscape(text, 0, text.Length);
+            writer.WriteEscape(text, 0, text.Length);
+        }
+    }
+
+
+    //[Benchmark]
+    //public void TestCustomIndexOfAny()
+    //{
+    //    var writer = new HtmlRenderer(new StringWriter());
+    //    for (int i = 0; i < 100; i++)
+    //    {
+    //        writer.WriteEscapeOptimized(text, 0, text.Length);
+    //        writer.WriteEscapeOptimized(text, 0, text.Length);
+    //        writer.WriteEscapeOptimized(text, 0, text.Length);
+    //        writer.WriteEscapeOptimized(text, 0, text.Length);
+    //        writer.WriteEscapeOptimized(text, 0, text.Length);
+
+    //        writer.WriteEscapeOptimized(text, 0, text.Length);
+    //        writer.WriteEscapeOptimized(text, 0, text.Length);
+    //        writer.WriteEscapeOptimized(text, 0, text.Length);
+    //        writer.WriteEscapeOptimized(text, 0, text.Length);
+    //        writer.WriteEscapeOptimized(text, 0, text.Length);
+    //    }
+    //}
+
 }

src/Markdig.Tests/GlobalUsings.cs

@@ -0,0 +1,5 @@
+// Copyright (c) Alexandre Mutel. All rights reserved.
+// This file is licensed under the BSD-Clause 2 license.
+// See the license.txt file in the project root for more information.
+
+global using Assert = NUnit.Framework.Legacy.ClassicAssert;

src/Markdig.Tests/Markdig.Tests.csproj

@@ -1,18 +1,20 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFrameworks>net6.0;net8.0;net9.0</TargetFrameworks>
     <OutputType>Exe</OutputType>
     <IsPackable>false</IsPackable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <LangVersion>13.0</LangVersion>
     <StartupObject>Markdig.Tests.Program</StartupObject>
-    <SpecExecutable>$(MSBuildProjectDirectory)\..\SpecFileGen\bin\$(Configuration)\net6.0\SpecFileGen.dll</SpecExecutable>
-    <SpecTimestamp>$(MSBuildProjectDirectory)\..\SpecFileGen\bin\$(Configuration)\net6.0\SpecFileGen.timestamp</SpecTimestamp>
+    <SpecExecutable>$(MSBuildProjectDirectory)\..\SpecFileGen\bin\$(Configuration)\$(TargetFramework)\SpecFileGen.dll</SpecExecutable>
+    <SpecTimestamp>$(MSBuildProjectDirectory)\..\SpecFileGen\bin\$(Configuration)\$(TargetFramework)\SpecFileGen.timestamp</SpecTimestamp>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
-    <PackageReference Include="NUnit" Version="3.13.3" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="NUnit" Version="4.3.2" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
   </ItemGroup>
 
   <ItemGroup>
@@ -20,6 +22,10 @@
     <ProjectReference Include="..\SpecFileGen\SpecFileGen.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Using Include="NUnit.Framework" />
+  </ItemGroup>
+
   <ItemGroup>
     <ItemSpecExecutable Include="$(SpecExecutable)" />
     <InputSpecFiles Include="Specs\*.md" />

src/Markdig.Tests/MiscTests.cs

@@ -1,192 +1,192 @@
-using System;
-using System.IO;
-using System.Linq;
 using System.Text.RegularExpressions;
+
 using Markdig.Extensions.AutoLinks;
+using Markdig.Extensions.Tables;
+using Markdig.Syntax;
 using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class MiscTests
 {
-    public class MiscTests
+    [Test]
+    public void LinkWithInvalidNonAsciiDomainNameIsIgnored()
     {
-        [Test]
-        public void LinkWithInvalidNonAsciiDomainNameIsIgnored()
+        // Url from https://github.com/lunet-io/markdig/issues/438
+        _ = Markdown.ToHtml("[minulém díle](http://V%20minulém%20díle%20jsme%20nainstalovali%20SQL%20Server,%20který%20je%20nutný%20pro%20běh%20Configuration%20Manageru.%20Dnes%20nás%20čeká%20instalace%20WSUS,%20což%20je%20produkt,%20jež%20je%20možné%20používat%20i%20jako%20samostatnou%20funkci%20ve%20Windows%20Serveru,%20který%20se%20stará%20o%20stažení%20a%20instalaci%20aktualizací%20z%20Microsoft%20Update%20na%20klientské%20počítače.%20Stejně%20jako%20v%20předchozích%20dílech,%20tak%20i%20v%20tomto%20si%20ukážeme%20obě%20varianty%20instalace%20–%20a%20to%20jak%20instalaci%20z%20PowerShellu,%20tak%20instalaci%20pomocí%20GUI.) ");
+
+        // Valid IDN
+        TestParser.TestSpec("[foo](http://ünicode.com)", "<p><a href=\"http://xn--nicode-2ya.com\">foo</a></p>");
+        TestParser.TestSpec("[foo](http://ünicode.ünicode.com)", "<p><a href=\"http://xn--nicode-2ya.xn--nicode-2ya.com\">foo</a></p>");
+
+        // Invalid IDN
+        TestParser.TestSpec("[foo](http://ünicode..com)", "<p><a href=\"http://%C3%BCnicode..com\">foo</a></p>");
+    }
+
+    [TestCase("link [foo [bar]]")] // https://spec.commonmark.org/0.29/#example-508
+    [TestCase("link [foo][bar]")]
+    [TestCase("link [][foo][bar][]")]
+    [TestCase("link [][foo][bar][[]]")]
+    [TestCase("link [foo] [bar]")]
+    [TestCase("link [[foo] [] [bar] [[abc]def]]")]
+    [TestCase("[]")]
+    [TestCase("[ ]")]
+    [TestCase("[bar][]")]
+    [TestCase("[bar][ foo]")]
+    [TestCase("[bar][foo ][]")]
+    [TestCase("[bar][fo[ ]o ][][]")]
+    [TestCase("[a]b[c[d[e]f]g]h")]
+    [TestCase("a[b[c[d]e]f[g]h]i foo [j]k[l[m]n]o")]
+    [TestCase("a[b[c[d]e]f[g]h]i[] [][foo][bar][] foo [j]k[l[m]n]o")]
+    [TestCase("a[b[c[d]e]f[g]h]i foo [j]k[l[m]n]o[][]")]
+    public void LinkTextMayContainBalancedBrackets(string linkText)
+    {
+        string markdown = $"[{linkText}](/uri)";
+        string expected = $@"<p><a href=""/uri"">{linkText}</a></p>";
+
+        TestParser.TestSpec(markdown, expected);
+
+        // Make the link text unbalanced
+        foreach (var bracketIndex in linkText
+            .Select((c, i) => new Tuple<char, int>(c, i))
+            .Where(t => t.Item1 == '[' || t.Item1 == ']')
+            .Select(t => t.Item2))
         {
-            // Url from https://github.com/lunet-io/markdig/issues/438
-            _ = Markdown.ToHtml("[minulém díle](http://V%20minulém%20díle%20jsme%20nainstalovali%20SQL%20Server,%20který%20je%20nutný%20pro%20běh%20Configuration%20Manageru.%20Dnes%20nás%20čeká%20instalace%20WSUS,%20což%20je%20produkt,%20jež%20je%20možné%20používat%20i%20jako%20samostatnou%20funkci%20ve%20Windows%20Serveru,%20který%20se%20stará%20o%20stažení%20a%20instalaci%20aktualizací%20z%20Microsoft%20Update%20na%20klientské%20počítače.%20Stejně%20jako%20v%20předchozích%20dílech,%20tak%20i%20v%20tomto%20si%20ukážeme%20obě%20varianty%20instalace%20–%20a%20to%20jak%20instalaci%20z%20PowerShellu,%20tak%20instalaci%20pomocí%20GUI.) ");
+            string brokenLinkText = linkText.Remove(bracketIndex, 1);
 
-            // Valid IDN
-            TestParser.TestSpec("[foo](http://ünicode.com)", "<p><a href=\"http://xn--nicode-2ya.com\">foo</a></p>");
-            TestParser.TestSpec("[foo](http://ünicode.ünicode.com)", "<p><a href=\"http://xn--nicode-2ya.xn--nicode-2ya.com\">foo</a></p>");
+            markdown = $"[{brokenLinkText}](/uri)";
+            expected = $@"<p><a href=""/uri"">{brokenLinkText}</a></p>";
 
-            // Invalid IDN
-            TestParser.TestSpec("[foo](http://ünicode..com)", "<p><a href=\"http://%C3%BCnicode..com\">foo</a></p>");
+            string actual = Markdown.ToHtml(markdown);
+            Assert.AreNotEqual(expected, actual);
         }
+    }
 
-        [TestCase("link [foo [bar]]")] // https://spec.commonmark.org/0.29/#example-508
-        [TestCase("link [foo][bar]")]
-        [TestCase("link [][foo][bar][]")]
-        [TestCase("link [][foo][bar][[]]")]
-        [TestCase("link [foo] [bar]")]
-        [TestCase("link [[foo] [] [bar] [[abc]def]]")]
-        [TestCase("[]")]
-        [TestCase("[ ]")]
-        [TestCase("[bar][]")]
-        [TestCase("[bar][ foo]")]
-        [TestCase("[bar][foo ][]")]
-        [TestCase("[bar][fo[ ]o ][][]")]
-        [TestCase("[a]b[c[d[e]f]g]h")]
-        [TestCase("a[b[c[d]e]f[g]h]i foo [j]k[l[m]n]o")]
-        [TestCase("a[b[c[d]e]f[g]h]i[] [][foo][bar][] foo [j]k[l[m]n]o")]
-        [TestCase("a[b[c[d]e]f[g]h]i foo [j]k[l[m]n]o[][]")]
-        public void LinkTextMayContainBalancedBrackets(string linkText)
+    [Theory]
+    [TestCase('[', 9 * 1024, true, false)]
+    [TestCase('[', 11 * 1024, true, true)]
+    [TestCase('[', 100, false, false)]
+    [TestCase('[', 150, false, true)]
+    [TestCase('>', 100, true, false)]
+    [TestCase('>', 150, true, true)]
+    public void GuardsAgainstHighlyNestedNodes(char c, int count, bool parseOnly, bool shouldThrow)
+    {
+        var markdown = new string(c, count);
+        TestDelegate test = parseOnly ? () => Markdown.Parse(markdown) : () => Markdown.ToHtml(markdown);
+
+        if (shouldThrow)
         {
-            string markdown = $"[{linkText}](/uri)";
-            string expected = $@"<p><a href=""/uri"">{linkText}</a></p>";
-
-            TestParser.TestSpec(markdown, expected);
-
-            // Make the link text unbalanced
-            foreach (var bracketIndex in linkText
-                .Select((c, i) => new Tuple<char, int>(c, i))
-                .Where(t => t.Item1 == '[' || t.Item1 == ']')
-                .Select(t => t.Item2))
-            {
-                string brokenLinkText = linkText.Remove(bracketIndex, 1);
-
-                markdown = $"[{brokenLinkText}](/uri)";
-                expected = $@"<p><a href=""/uri"">{brokenLinkText}</a></p>";
-
-                string actual = Markdown.ToHtml(markdown);
-                Assert.AreNotEqual(expected, actual);
-            }
+            Exception e = Assert.Throws<ArgumentException>(test);
+            Assert.True(e.Message.Contains("depth limit"));
         }
-
-        [Theory]
-        [TestCase('[', 9 * 1024, true, false)]
-        [TestCase('[', 11 * 1024, true, true)]
-        [TestCase('[', 100, false, false)]
-        [TestCase('[', 150, false, true)]
-        [TestCase('>', 100, true, false)]
-        [TestCase('>', 150, true, true)]
-        public void GuardsAgainstHighlyNestedNodes(char c, int count, bool parseOnly, bool shouldThrow)
+        else
         {
-            var markdown = new string(c, count);
-            TestDelegate test = parseOnly ? () => Markdown.Parse(markdown) : () => Markdown.ToHtml(markdown);
-
-            if (shouldThrow)
-            {
-                Exception e = Assert.Throws<ArgumentException>(test);
-                Assert.True(e.Message.Contains("depth limit"));
-            }
-            else
-            {
-                test();
-            }
+            test();
         }
+    }
 
-        [Test]
-        public void IsIssue356Corrected()
+    [Test]
+    public void IsIssue356Corrected()
+    {
+        string input = @"https://foo.bar/path/\#m4mv5W0GYKZpGvfA.97";
+        string expected = @"<p><a href=""https://foo.bar/path/%5C#m4mv5W0GYKZpGvfA.97"">https://foo.bar/path/\#m4mv5W0GYKZpGvfA.97</a></p>";
+
+        TestParser.TestSpec($"<{input}>", expected);
+        TestParser.TestSpec(input, expected, "autolinks|advanced");
+    }
+
+    [Test]
+    public void IsIssue365Corrected()
+    {
+        // The scheme must be escaped too...
+        string input = "![image](\"onclick=\"alert&amp;#40;'click'&amp;#41;\"://)";
+        string expected = "<p><img src=\"%22onclick=%22alert&amp;#40;%27click%27&amp;#41;%22://\" alt=\"image\" /></p>";
+
+        TestParser.TestSpec(input, expected);
+    }
+
+    [Test]
+    public void TestAltTextIsCorrectlyEscaped()
+    {
+        TestParser.TestSpec(
+            @"![This is image alt text with quotation ' and double quotation ""hello"" world](girl.png)",
+            @"<p><img src=""girl.png"" alt=""This is image alt text with quotation ' and double quotation &quot;hello&quot; world"" /></p>");
+    }
+
+    [Test]
+    public void TestChangelogPRLinksMatchDescription()
+    {
+        string solutionFolder = Path.GetFullPath(Path.Combine(TestParser.TestsDirectory, "../.."));
+        string changelogPath = Path.Combine(solutionFolder, "changelog.md");
+        string changelog = File.ReadAllText(changelogPath);
+        var matches = Regex.Matches(changelog, @"\(\[\(PR #(\d+)\)\]\(.*?pull\/(\d+)\)\)");
+        Assert.Greater(matches.Count, 0);
+        foreach (Match match in matches)
         {
-            string input = @"https://foo.bar/path/\#m4mv5W0GYKZpGvfA.97";
-            string expected = @"<p><a href=""https://foo.bar/path/%5C#m4mv5W0GYKZpGvfA.97"">https://foo.bar/path/\#m4mv5W0GYKZpGvfA.97</a></p>";
-
-            TestParser.TestSpec($"<{input}>", expected);
-            TestParser.TestSpec(input, expected, "autolinks|advanced");
+            Assert.True(int.TryParse(match.Groups[1].Value, out int textNr));
+            Assert.True(int.TryParse(match.Groups[2].Value, out int linkNr));
+            Assert.AreEqual(textNr, linkNr);
         }
+    }
 
-        [Test]
-        public void IsIssue365Corrected()
-        {
-            // The scheme must be escaped too...
-            string input = "![image](\"onclick=\"alert&amp;#40;'click'&amp;#41;\"://)";
-            string expected = "<p><img src=\"%22onclick=%22alert&amp;#40;%27click%27&amp;#41;%22://\" alt=\"image\" /></p>";
+    [Test]
+    public void TestFixHang()
+    {
+        var input = File.ReadAllText(Path.Combine(TestParser.TestsDirectory, "hang.md"));
+        _ = Markdown.ToHtml(input);
+    }
 
-            TestParser.TestSpec(input, expected);
-        }
+    [Test]
+    public void TestInvalidHtmlEntity()
+    {
+        var input = "9&ddr;&*&ddr;&de<64><65>__";
+        TestParser.TestSpec(input, "<p>9&amp;ddr;&amp;*&amp;ddr;&amp;de<64><65>__</p>");
+    }
 
-        [Test]
-        public void TestAltTextIsCorrectlyEscaped()
-        {
-            TestParser.TestSpec(
-                @"![This is image alt text with quotation ' and double quotation ""hello"" world](girl.png)",
-                @"<p><img src=""girl.png"" alt=""This is image alt text with quotation ' and double quotation &quot;hello&quot; world"" /></p>");
-        }
+    [Test]
+    public void TestInvalidCharacterHandling()
+    {
+        var input = File.ReadAllText(Path.Combine(TestParser.TestsDirectory, "ArgumentOutOfRangeException.md"));
+        _ = Markdown.ToHtml(input);
+    }
 
-        [Test]
-        public void TestChangelogPRLinksMatchDescription()
-        {
-            string solutionFolder = Path.GetFullPath(Path.Combine(TestParser.TestsDirectory, "../.."));
-            string changelogPath = Path.Combine(solutionFolder, "changelog.md");
-            string changelog = File.ReadAllText(changelogPath);
-            var matches = Regex.Matches(changelog, @"\(\[\(PR #(\d+)\)\]\(.*?pull\/(\d+)\)\)");
-            Assert.Greater(matches.Count, 0);
-            foreach (Match match in matches)
-            {
-                Assert.True(int.TryParse(match.Groups[1].Value, out int textNr));
-                Assert.True(int.TryParse(match.Groups[2].Value, out int linkNr));
-                Assert.AreEqual(textNr, linkNr);
-            }
-        }
+    [Test]
+    public void TestInvalidCodeEscape()
+    {
+        var input = "```**Header**	";
+        _ = Markdown.ToHtml(input);
+    }
 
-        [Test]
-        public void TestFixHang()
-        {
-            var input = File.ReadAllText(Path.Combine(TestParser.TestsDirectory, "hang.md"));
-            _ = Markdown.ToHtml(input);
-        }
+    [Test]
+    public void TestEmphasisAndHtmlEntity()
+    {
+        var markdownText = "*Unlimited-Fun&#174;*&#174;";
+        TestParser.TestSpec(markdownText, "<p><em>Unlimited-Fun®</em>®</p>");
+    }
 
-        [Test]
-        public void TestInvalidHtmlEntity()
-        {
-            var input = "9&ddr;&*&ddr;&de<64><65>__";
-            TestParser.TestSpec(input, "<p>9&amp;ddr;&amp;*&amp;ddr;&amp;de<64><65>__</p>");
-        }
-
-        [Test]
-        public void TestInvalidCharacterHandling()
-        {
-            var input = File.ReadAllText(Path.Combine(TestParser.TestsDirectory, "ArgumentOutOfRangeException.md"));
-            _ = Markdown.ToHtml(input);
-        }
-
-        [Test]
-        public void TestInvalidCodeEscape()
-        {
-            var input = "```**Header**	";
-            _ = Markdown.ToHtml(input);
-        }
-
-        [Test]
-        public void TestEmphasisAndHtmlEntity()
-        {
-            var markdownText = "*Unlimited-Fun&#174;*&#174;";
-            TestParser.TestSpec(markdownText, "<p><em>Unlimited-Fun®</em>®</p>");
-        }
-
-        [Test]
-        public void TestThematicInsideCodeBlockInsideList()
-        {
-            var input = @"1. In the :
+    [Test]
+    public void TestThematicInsideCodeBlockInsideList()
+    {
+        var input = @"1. In the :
 
    ```
    Id                                   DisplayName         Description
    --                                   -----------         -----------
    62375ab9-6b52-47ed-826b-58e47e0e304b Group.Unified       ...
    ```";
-            TestParser.TestSpec(input, @"<ol>
+        TestParser.TestSpec(input, @"<ol>
 <li><p>In the :</p>
 <pre><code>Id                                   DisplayName         Description
 --                                   -----------         -----------
 62375ab9-6b52-47ed-826b-58e47e0e304b Group.Unified       ...
 </code></pre></li>
 </ol>");
-        }
+    }
 
-        [Test]
-        public void VisualizeMathExpressions()
-        {
-            string math = @"Math expressions
+    [Test]
+    public void VisualizeMathExpressions()
+    {
+        string math = @"Math expressions
 
 $\frac{n!}{k!(n-k)!} = \binom{n}{k}$
 
@@ -199,98 +199,191 @@ $$
 <div class=""math"">
 \begin{align}
 \sqrt{37} & = \sqrt{\frac{73^2-1}{12^2}} \\
- & = \sqrt{\frac{73^2}{12^2}\cdot\frac{73^2-1}{73^2}} \\ 
+ & = \sqrt{\frac{73^2}{12^2}\cdot\frac{73^2-1}{73^2}} \\
  & = \sqrt{\frac{73^2}{12^2}}\sqrt{\frac{73^2-1}{73^2}} \\
- & = \frac{73}{12}\sqrt{1 - \frac{1}{73^2}} \\ 
+ & = \frac{73}{12}\sqrt{1 - \frac{1}{73^2}} \\
  & \approx \frac{73}{12}\left(1 - \frac{1}{2\cdot73^2}\right)
 \end{align}
 </div>
 ";
-            //Console.WriteLine("Math Expressions:\n");
-            var pl = new MarkdownPipelineBuilder().UseMathematics().Build(); // UseEmphasisExtras(EmphasisExtraOptions.Subscript).Build()
-            var html = Markdown.ToHtml(math, pl);
-            //Console.WriteLine(html);
-        }
+        //Console.WriteLine("Math Expressions:\n");
+        var pl = new MarkdownPipelineBuilder().UseMathematics().Build(); // UseEmphasisExtras(EmphasisExtraOptions.Subscript).Build()
+        var html = Markdown.ToHtml(math, pl);
+        //Console.WriteLine(html);
+    }
 
-        [Test]
-        public void InlineMathExpression()
-        {
-            string math = @"Math expressions
+    [Test]
+    public void InlineMathExpression()
+    {
+        string math = @"Math expressions
 
 $\frac{n!}{k!(n-k)!} = \binom{n}{k}$
 ";
-            var pl = new MarkdownPipelineBuilder().UseMathematics().Build(); // UseEmphasisExtras(EmphasisExtraOptions.Subscript).Build()
+        var pl = new MarkdownPipelineBuilder().UseMathematics().Build(); // UseEmphasisExtras(EmphasisExtraOptions.Subscript).Build()
 
-            var html = Markdown.ToHtml(math, pl);
+        var html = Markdown.ToHtml(math, pl);
 
-            var test1 = html.Contains("<p><span class=\"math\">\\(");
-            var test2 = html.Contains("\\)</span></p>");
-            if (!test1 || !test2)
-            {
-                Console.WriteLine(html);
-            }
-
-            Assert.IsTrue(test1, "Leading bracket missing");
-            Assert.IsTrue(test2, "Trailing bracket missing");
+        var test1 = html.Contains("<p><span class=\"math\">\\(");
+        var test2 = html.Contains("\\)</span></p>");
+        if (!test1 || !test2)
+        {
+            Console.WriteLine(html);
         }
 
-        [Test]
-        public void BlockMathExpression()
-        {
-            string math = @"Math expressions
+        Assert.IsTrue(test1, "Leading bracket missing");
+        Assert.IsTrue(test2, "Trailing bracket missing");
+    }
+
+    [Test]
+    public void BlockMathExpression()
+    {
+        string math = @"Math expressions
 
 $$
 \frac{n!}{k!(n-k)!} = \binom{n}{k}
 $$
 ";
-            var pl = new MarkdownPipelineBuilder().UseMathematics().Build(); // UseEmphasisExtras(EmphasisExtraOptions.Subscript).Build()
+        var pl = new MarkdownPipelineBuilder().UseMathematics().Build(); // UseEmphasisExtras(EmphasisExtraOptions.Subscript).Build()
 
-            var html = Markdown.ToHtml(math, pl);
-            var test1 = html.Contains("<div class=\"math\">\n\\[");
-            var test2 = html.Contains("\\]</div>");
-            if (!test1 || !test2)
-            {
-                Console.WriteLine(html);
-            }
-
-            Assert.IsTrue(test1, "Leading bracket missing");
-            Assert.IsTrue(test2, "Trailing bracket missing");
-        }
-
-        [Test]
-        public void CanDisableParsingHeadings()
+        var html = Markdown.ToHtml(math, pl);
+        var test1 = html.Contains("<div class=\"math\">\n\\[");
+        var test2 = html.Contains("\\]</div>");
+        if (!test1 || !test2)
         {
-            var noHeadingsPipeline = new MarkdownPipelineBuilder().DisableHeadings().Build();
-
-            TestParser.TestSpec("Foo\n===", "<h1>Foo</h1>");
-            TestParser.TestSpec("Foo\n===", "<p>Foo\n===</p>", noHeadingsPipeline);
-
-            TestParser.TestSpec("# Heading 1", "<h1>Heading 1</h1>");
-            TestParser.TestSpec("# Heading 1", "<p># Heading 1</p>", noHeadingsPipeline);
-
-            // Does not also disable link reference definitions
-            TestParser.TestSpec("[Foo]\n\n[Foo]: bar", "<p><a href=\"bar\">Foo</a></p>");
-            TestParser.TestSpec("[Foo]\n\n[Foo]: bar", "<p><a href=\"bar\">Foo</a></p>", noHeadingsPipeline);
+            Console.WriteLine(html);
         }
 
-        [Test]
-        public void CanOpenAutoLinksInNewWindow()
-        {
-            var pipeline = new MarkdownPipelineBuilder().UseAutoLinks().Build();
-            var newWindowPipeline = new MarkdownPipelineBuilder().UseAutoLinks(new AutoLinkOptions() { OpenInNewWindow = true }).Build();
+        Assert.IsTrue(test1, "Leading bracket missing");
+        Assert.IsTrue(test2, "Trailing bracket missing");
+    }
 
-            TestParser.TestSpec("www.foo.bar", "<p><a href=\"http://www.foo.bar\">www.foo.bar</a></p>", pipeline);
-            TestParser.TestSpec("www.foo.bar", "<p><a href=\"http://www.foo.bar\" target=\"_blank\">www.foo.bar</a></p>", newWindowPipeline);
-        }
+    [Test]
+    public void CanDisableParsingHeadings()
+    {
+        var noHeadingsPipeline = new MarkdownPipelineBuilder().DisableHeadings().Build();
 
-        [Test]
-        public void CanUseHttpsPrefixForWWWAutoLinks()
-        {
-            var pipeline = new MarkdownPipelineBuilder().UseAutoLinks().Build();
-            var httpsPipeline = new MarkdownPipelineBuilder().UseAutoLinks(new AutoLinkOptions() { UseHttpsForWWWLinks = true }).Build();
+        TestParser.TestSpec("Foo\n===", "<h1>Foo</h1>");
+        TestParser.TestSpec("Foo\n===", "<p>Foo\n===</p>", noHeadingsPipeline);
 
-            TestParser.TestSpec("www.foo.bar", "<p><a href=\"http://www.foo.bar\">www.foo.bar</a></p>", pipeline);
-            TestParser.TestSpec("www.foo.bar", "<p><a href=\"https://www.foo.bar\">www.foo.bar</a></p>", httpsPipeline);
-        }
+        TestParser.TestSpec("# Heading 1", "<h1>Heading 1</h1>");
+        TestParser.TestSpec("# Heading 1", "<p># Heading 1</p>", noHeadingsPipeline);
+
+        // Does not also disable link reference definitions
+        TestParser.TestSpec("[Foo]\n\n[Foo]: bar", "<p><a href=\"bar\">Foo</a></p>");
+        TestParser.TestSpec("[Foo]\n\n[Foo]: bar", "<p><a href=\"bar\">Foo</a></p>", noHeadingsPipeline);
+    }
+
+    [Test]
+    public void CanOpenAutoLinksInNewWindow()
+    {
+        var pipeline = new MarkdownPipelineBuilder().UseAutoLinks().Build();
+        var newWindowPipeline = new MarkdownPipelineBuilder().UseAutoLinks(new AutoLinkOptions() { OpenInNewWindow = true }).Build();
+
+        TestParser.TestSpec("www.foo.bar", "<p><a href=\"http://www.foo.bar\">www.foo.bar</a></p>", pipeline);
+        TestParser.TestSpec("www.foo.bar", "<p><a href=\"http://www.foo.bar\" target=\"_blank\">www.foo.bar</a></p>", newWindowPipeline);
+    }
+
+    [Test]
+    public void CanUseHttpsPrefixForWWWAutoLinks()
+    {
+        var pipeline = new MarkdownPipelineBuilder().UseAutoLinks().Build();
+        var httpsPipeline = new MarkdownPipelineBuilder().UseAutoLinks(new AutoLinkOptions() { UseHttpsForWWWLinks = true }).Build();
+
+        TestParser.TestSpec("www.foo.bar", "<p><a href=\"http://www.foo.bar\">www.foo.bar</a></p>", pipeline);
+        TestParser.TestSpec("www.foo.bar", "<p><a href=\"https://www.foo.bar\">www.foo.bar</a></p>", httpsPipeline);
+    }
+
+    [Test]
+    public void RootInlineHasCorrectSourceSpan()
+    {
+        var pipeline = new MarkdownPipelineBuilder().UsePreciseSourceLocation().Build();
+        pipeline.TrackTrivia = true;
+
+        var document = Markdown.Parse("0123456789\n", pipeline);
+
+        var expectedSourceSpan = new SourceSpan(0, 10);
+        Assert.That(((LeafBlock)document.LastChild).Inline.Span == expectedSourceSpan);
+    }
+
+    [Test]
+    public void RootInlineInTableCellHasCorrectSourceSpan()
+    {
+        var pipeline = new MarkdownPipelineBuilder().UsePreciseSourceLocation().UseAdvancedExtensions().Build();
+        pipeline.TrackTrivia = true;
+
+        var document = Markdown.Parse("| a | b |\n| --- | --- |\n| <span id=\"dest\"></span><span id=\"DEST\"></span>*dest*<br/> | \\[in\\] The address of the result of the operation.<br/> |", pipeline);
+
+        var paragraph = (ParagraphBlock)((TableCell)((TableRow)((Table)document.LastChild).LastChild).First()).LastChild;
+        Assert.That(paragraph.Inline.Span.Start == paragraph.Inline.FirstChild.Span.Start);
+        Assert.That(paragraph.Inline.Span.End == paragraph.Inline.LastChild.Span.End);
+    }
+
+    [Test]
+    public void TestGridTableShortLine()
+    {
+        var input = @"
++--+
+|  |
++-";
+
+        var expected = @"<table>
+<col style=""width:100%"" />
+<tbody>
+<tr>
+<td></td>
+</tr>
+</tbody>
+</table>
+";
+        TestParser.TestSpec(input, expected, new MarkdownPipelineBuilder().UseGridTables().Build());
+    }
+  
+    [Test]
+    public void TestDefinitionListInListItemWithBlankLine()
+    {
+        var input = @"
+- 
+
+  term
+  :   definition
+";
+
+        var expected = @"<ul>
+<li>
+<dl>
+<dt>term</dt>
+<dd>definition</dd>
+</dl>
+</li>
+</ul>
+";
+        TestParser.TestSpec(input, expected, new MarkdownPipelineBuilder().UseDefinitionLists().Build());
+    }
+
+    [Test]
+    public void TestAlertWithinAlertOrNestedBlock()
+    {
+        var input = @"
+>[!NOTE]
+[!NOTE]
+The second one is not a note.
+
+>>[!NOTE]
+Also not a note.
+";
+
+        var expected = @"<div class=""markdown-alert markdown-alert-note"">
+<p class=""markdown-alert-title""><svg viewBox=""0 0 16 16"" version=""1.1"" width=""16"" height=""16"" aria-hidden=""true""><path d=""M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z""></path></svg>Note</p>
+<p>[!NOTE]
+The second one is not a note.</p>
+</div>
+<blockquote>
+<blockquote>
+<p>[!NOTE]
+Also not a note.</p>
+</blockquote>
+</blockquote>
+";
+        TestParser.TestSpec(input, expected, new MarkdownPipelineBuilder().UseAlertBlocks().Build());
     }
 }

src/Markdig.Tests/Program.cs

@@ -2,18 +2,15 @@
 // This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
 
-using System;
+namespace Markdig.Tests;
 
-namespace Markdig.Tests
+class Program
 {
-    class Program
+    public static void Main(string[] args)
     {
-        public static void Main(string[] args)
-        {
-            Console.WriteLine("Run NUnit tests runner with this");
-            // Uncomment the following line to debug a specific tests more easily
-            //var tests = new Specs.CommonMarkV_0_29.TestLeafBlocksSetextHeadings();
-            //tests.LeafBlocksSetextHeadings_Example063();
-        }
+        Console.WriteLine("Run NUnit tests runner with this");
+        // Uncomment the following line to debug a specific tests more easily
+        //var tests = new Specs.CommonMarkV_0_29.TestLeafBlocksSetextHeadings();
+        //tests.LeafBlocksSetextHeadings_Example063();
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestAtxHeading.cs

@@ -1,55 +1,53 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestAtxHeading
 {
-    [TestFixture]
-    public class TestAtxHeading
+    [TestCase("# h")]
+    [TestCase("# h ")]
+    [TestCase("# h\n#h")]
+    [TestCase("# h\n #h")]
+    [TestCase("# h\n # h")]
+    [TestCase("# h\n # h ")]
+    [TestCase(" #  h   \n    #     h      ")]
+    public void Test(string value)
     {
-        [TestCase("# h")]
-        [TestCase("# h ")]
-        [TestCase("# h\n#h")]
-        [TestCase("# h\n #h")]
-        [TestCase("# h\n # h")]
-        [TestCase("# h\n # h ")]
-        [TestCase(" #  h   \n    #     h      ")]
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
+        RoundTrip(value);
+    }
 
-        [TestCase("\n# h\n\np")]
-        [TestCase("\n# h\n\np\n")]
-        [TestCase("\n# h\n\np\n\n")]
-        [TestCase("\n\n# h\n\np\n\n")]
-        [TestCase("\n\n# h\np\n\n")]
-        [TestCase("\n\n# h\np\n\n")]
-        public void TestParagraph(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("\n# h\n\np")]
+    [TestCase("\n# h\n\np\n")]
+    [TestCase("\n# h\n\np\n\n")]
+    [TestCase("\n\n# h\n\np\n\n")]
+    [TestCase("\n\n# h\np\n\n")]
+    [TestCase("\n\n# h\np\n\n")]
+    public void TestParagraph(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("\n# h")]
-        [TestCase("\n# h\n")]
-        [TestCase("\n# h\r")]
-        [TestCase("\n# h\r\n")]
+    [TestCase("\n# h")]
+    [TestCase("\n# h\n")]
+    [TestCase("\n# h\r")]
+    [TestCase("\n# h\r\n")]
 
-        [TestCase("\r# h")]
-        [TestCase("\r# h\n")]
-        [TestCase("\r# h\r")]
-        [TestCase("\r# h\r\n")]
+    [TestCase("\r# h")]
+    [TestCase("\r# h\n")]
+    [TestCase("\r# h\r")]
+    [TestCase("\r# h\r\n")]
 
-        [TestCase("\r\n# h")]
-        [TestCase("\r\n# h\n")]
-        [TestCase("\r\n# h\r")]
-        [TestCase("\r\n# h\r\n")]
+    [TestCase("\r\n# h")]
+    [TestCase("\r\n# h\n")]
+    [TestCase("\r\n# h\r")]
+    [TestCase("\r\n# h\r\n")]
 
-        [TestCase("# h\n\n ")]
-        [TestCase("# h\n\n  ")]
-        [TestCase("# h\n\n   ")]
-        public void TestNewline(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("# h\n\n ")]
+    [TestCase("# h\n\n  ")]
+    [TestCase("# h\n\n   ")]
+    public void TestNewline(string value)
+    {
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestFencedCodeBlock.cs

@@ -1,107 +1,105 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestFencedCodeBlock
 {
-    [TestFixture]
-    public class TestFencedCodeBlock
+    [TestCase("```\nc\n```")]
+    [TestCase("```\nc\n```\n")]
+    [TestCase("\n```\nc\n```")]
+    [TestCase("\n\n```\nc\n```")]
+    [TestCase("```\nc\n```\n")]
+    [TestCase("```\nc\n```\n\n")]
+    [TestCase("\n```\nc\n```\n")]
+    [TestCase("\n```\nc\n```\n\n")]
+    [TestCase("\n\n```\nc\n```\n")]
+    [TestCase("\n\n```\nc\n```\n\n")]
+
+    [TestCase(" ```\nc\n````")]
+    [TestCase("```\nc\n````")]
+    [TestCase("p\n\n```\nc\n```")]
+
+    [TestCase("```\n c\n```")]
+    [TestCase("```\nc \n```")]
+    [TestCase("```\n c \n```")]
+
+    [TestCase(" ``` \n c \n ``` ")]
+    [TestCase("\t```\t\n\tc\t\n\t```\t")]
+    [TestCase("\v```\v\n\vc\v\n\v```\v")]
+    [TestCase("\f```\f\n\fc\f\n\f```\f")]
+    public void Test(string value)
     {
-        [TestCase("```\nc\n```")]
-        [TestCase("```\nc\n```\n")]
-        [TestCase("\n```\nc\n```")]
-        [TestCase("\n\n```\nc\n```")]
-        [TestCase("```\nc\n```\n")]
-        [TestCase("```\nc\n```\n\n")]
-        [TestCase("\n```\nc\n```\n")]
-        [TestCase("\n```\nc\n```\n\n")]
-        [TestCase("\n\n```\nc\n```\n")]
-        [TestCase("\n\n```\nc\n```\n\n")]
+        RoundTrip(value);
+    }
 
-        [TestCase(" ```\nc\n````")]
-        [TestCase("```\nc\n````")]
-        [TestCase("p\n\n```\nc\n```")]
+    [TestCase("~~~ aa ``` ~~~\nfoo\n~~~")]
+    [TestCase("~~~ aa ``` ~~~\nfoo\n~~~ ")]
+    public void TestTilde(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("```\n c\n```")]
-        [TestCase("```\nc \n```")]
-        [TestCase("```\n c \n```")]
+    [TestCase("```\n c \n```")]
+    [TestCase("```\n c \r```")]
+    [TestCase("```\n c \r\n```")]
+    [TestCase("```\r c \n```")]
+    [TestCase("```\r c \r```")]
+    [TestCase("```\r c \r\n```")]
+    [TestCase("```\r\n c \n```")]
+    [TestCase("```\r\n c \r```")]
+    [TestCase("```\r\n c \r\n```")]
 
-        [TestCase(" ``` \n c \n ``` ")]
-        [TestCase("\t```\t\n\tc\t\n\t```\t")]
-        [TestCase("\v```\v\n\vc\v\n\v```\v")]
-        [TestCase("\f```\f\n\fc\f\n\f```\f")]
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("```\n c \n```\n")]
+    [TestCase("```\n c \r```\n")]
+    [TestCase("```\n c \r\n```\n")]
+    [TestCase("```\r c \n```\n")]
+    [TestCase("```\r c \r```\n")]
+    [TestCase("```\r c \r\n```\n")]
+    [TestCase("```\r\n c \n```\n")]
+    [TestCase("```\r\n c \r```\n")]
+    [TestCase("```\r\n c \r\n```\n")]
 
-        [TestCase("~~~ aa ``` ~~~\nfoo\n~~~")]
-        [TestCase("~~~ aa ``` ~~~\nfoo\n~~~ ")]
-        public void TestTilde(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("```\n c \n```\r")]
+    [TestCase("```\n c \r```\r")]
+    [TestCase("```\n c \r\n```\r")]
+    [TestCase("```\r c \n```\r")]
+    [TestCase("```\r c \r```\r")]
+    [TestCase("```\r c \r\n```\r")]
+    [TestCase("```\r\n c \n```\r")]
+    [TestCase("```\r\n c \r```\r")]
+    [TestCase("```\r\n c \r\n```\r")]
 
-        [TestCase("```\n c \n```")]
-        [TestCase("```\n c \r```")]
-        [TestCase("```\n c \r\n```")]
-        [TestCase("```\r c \n```")]
-        [TestCase("```\r c \r```")]
-        [TestCase("```\r c \r\n```")]
-        [TestCase("```\r\n c \n```")]
-        [TestCase("```\r\n c \r```")]
-        [TestCase("```\r\n c \r\n```")]
+    [TestCase("```\n c \n```\r\n")]
+    [TestCase("```\n c \r```\r\n")]
+    [TestCase("```\n c \r\n```\r\n")]
+    [TestCase("```\r c \n```\r\n")]
+    [TestCase("```\r c \r```\r\n")]
+    [TestCase("```\r c \r\n```\r\n")]
+    [TestCase("```\r\n c \n```\r\n")]
+    [TestCase("```\r\n c \r```\r\n")]
+    [TestCase("```\r\n c \r\n```\r\n")]
+    public void TestNewline(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("```\n c \n```\n")]
-        [TestCase("```\n c \r```\n")]
-        [TestCase("```\n c \r\n```\n")]
-        [TestCase("```\r c \n```\n")]
-        [TestCase("```\r c \r```\n")]
-        [TestCase("```\r c \r\n```\n")]
-        [TestCase("```\r\n c \n```\n")]
-        [TestCase("```\r\n c \r```\n")]
-        [TestCase("```\r\n c \r\n```\n")]
+    [TestCase("```i a\n```")]
+    [TestCase("```i a a2\n```")]
+    [TestCase("```i a a2 a3\n```")]
+    [TestCase("```i a a2 a3 a4\n```")]
 
-        [TestCase("```\n c \n```\r")]
-        [TestCase("```\n c \r```\r")]
-        [TestCase("```\n c \r\n```\r")]
-        [TestCase("```\r c \n```\r")]
-        [TestCase("```\r c \r```\r")]
-        [TestCase("```\r c \r\n```\r")]
-        [TestCase("```\r\n c \n```\r")]
-        [TestCase("```\r\n c \r```\r")]
-        [TestCase("```\r\n c \r\n```\r")]
+    [TestCase("```i\ta\n```")]
+    [TestCase("```i\ta a2\n```")]
+    [TestCase("```i\ta a2 a3\n```")]
+    [TestCase("```i\ta a2 a3 a4\n```")]
 
-        [TestCase("```\n c \n```\r\n")]
-        [TestCase("```\n c \r```\r\n")]
-        [TestCase("```\n c \r\n```\r\n")]
-        [TestCase("```\r c \n```\r\n")]
-        [TestCase("```\r c \r```\r\n")]
-        [TestCase("```\r c \r\n```\r\n")]
-        [TestCase("```\r\n c \n```\r\n")]
-        [TestCase("```\r\n c \r```\r\n")]
-        [TestCase("```\r\n c \r\n```\r\n")]
-        public void TestNewline(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("```i a\n```")]
-        [TestCase("```i a a2\n```")]
-        [TestCase("```i a a2 a3\n```")]
-        [TestCase("```i a a2 a3 a4\n```")]
-
-        [TestCase("```i\ta\n```")]
-        [TestCase("```i\ta a2\n```")]
-        [TestCase("```i\ta a2 a3\n```")]
-        [TestCase("```i\ta a2 a3 a4\n```")]
-
-        [TestCase("```i\ta \n```")]
-        [TestCase("```i\ta a2 \n```")]
-        [TestCase("```i\ta a2 a3 \n```")]
-        [TestCase("```i\ta a2 a3 a4 \n```")]
-        public void TestInfoArguments(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("```i\ta \n```")]
+    [TestCase("```i\ta a2 \n```")]
+    [TestCase("```i\ta a2 a3 \n```")]
+    [TestCase("```i\ta a2 a3 a4 \n```")]
+    public void TestInfoArguments(string value)
+    {
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestHtmlBlock.cs

@@ -1,20 +1,18 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestHtmlBlock
 {
-    [TestFixture]
-    public class TestHtmlBlock
+    [TestCase("<br>")]
+    [TestCase("<br>\n")]
+    [TestCase("<br>\n\n")]
+    [TestCase("<div></div>\n\n# h")]
+    [TestCase("p\n\n<div></div>\n")]
+    [TestCase("<div></div>\n\n# h")]
+    public void Test(string value)
     {
-        [TestCase("<br>")]
-        [TestCase("<br>\n")]
-        [TestCase("<br>\n\n")]
-        [TestCase("<div></div>\n\n# h")]
-        [TestCase("p\n\n<div></div>\n")]
-        [TestCase("<div></div>\n\n# h")]
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestIndentedCodeBlock.cs

@@ -1,86 +1,84 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestIndentedCodeBlock
 {
-    [TestFixture]
-    public class TestIndentedCodeBlock
+    // A codeblock is indented with 4 spaces. After the 4th space, whitespace is interpreted as content.
+    // l = line
+    [TestCase("    l")]
+    [TestCase("     l")]
+    [TestCase("\tl")]
+    [TestCase("\t\tl")]
+    [TestCase("\tl1\n    l1")]
+
+    [TestCase("\n    l")]
+    [TestCase("\n\n    l")]
+    [TestCase("\n    l\n")]
+    [TestCase("\n    l\n\n")]
+    [TestCase("\n\n    l\n")]
+    [TestCase("\n\n    l\n\n")]
+
+    [TestCase("    l\n    l")]
+    [TestCase("    l\n    l\n    l")]
+
+
+    // two newlines are needed for indented codeblock start after paragraph
+    [TestCase("p\n\n    l")]
+    [TestCase("p\n\n    l\n")]
+    [TestCase("p\n\n    l\n\n")]
+
+    [TestCase("p\n\n    l\n    l")]
+    [TestCase("p\n\n    l\n     l")]
+
+    [TestCase("    l\n\np\n\n    l")]
+    [TestCase("    l    l\n\np\n\n    l    l")]
+    public void Test(string value)
     {
-        // A codeblock is indented with 4 spaces. After the 4th space, whitespace is interpreted as content.
-        // l = line
-        [TestCase("    l")]
-        [TestCase("     l")]
-        [TestCase("\tl")]
-        [TestCase("\t\tl")]
-        [TestCase("\tl1\n    l1")]
+        RoundTrip(value);
+    }
 
-        [TestCase("\n    l")]
-        [TestCase("\n\n    l")]
-        [TestCase("\n    l\n")]
-        [TestCase("\n    l\n\n")]
-        [TestCase("\n\n    l\n")]
-        [TestCase("\n\n    l\n\n")]
+    [TestCase("    l\n")]
+    [TestCase("    l\r")]
+    [TestCase("    l\r\n")]
 
-        [TestCase("    l\n    l")]
-        [TestCase("    l\n    l\n    l")]
+    [TestCase("    l\n    l")]
+    [TestCase("    l\n    l\n")]
+    [TestCase("    l\n    l\r")]
+    [TestCase("    l\n    l\r\n")]
 
+    [TestCase("    l\r    l")]
+    [TestCase("    l\r    l\n")]
+    [TestCase("    l\r    l\r")]
+    [TestCase("    l\r    l\r\n")]
 
-        // two newlines are needed for indented codeblock start after paragraph
-        [TestCase("p\n\n    l")]
-        [TestCase("p\n\n    l\n")]
-        [TestCase("p\n\n    l\n\n")]
+    [TestCase("    l\r\n    l")]
+    [TestCase("    l\r\n    l\n")]
+    [TestCase("    l\r\n    l\r")]
+    [TestCase("    l\r\n    l\r\n")]
+    public void TestNewline(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("p\n\n    l\n    l")]
-        [TestCase("p\n\n    l\n     l")]
+    [TestCase("    l\n\n    l\n")]
+    [TestCase("    l\n\n\n    l\n")]
+    public void TestNewlinesInBetweenResultInOneCodeBlock(string value)
+    {
+        var pipelineBuilder = new MarkdownPipelineBuilder();
+        pipelineBuilder.EnableTrackTrivia();
+        MarkdownPipeline pipeline = pipelineBuilder.Build();
+        var markdownDocument = Markdown.Parse(value, pipeline);
 
-        [TestCase("    l\n\np\n\n    l")]
-        [TestCase("    l    l\n\np\n\n    l    l")]
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
+        Assert.AreEqual(1, markdownDocument.Count);
+    }
 
-        [TestCase("    l\n")]
-        [TestCase("    l\r")]
-        [TestCase("    l\r\n")]
-
-        [TestCase("    l\n    l")]
-        [TestCase("    l\n    l\n")]
-        [TestCase("    l\n    l\r")]
-        [TestCase("    l\n    l\r\n")]
-
-        [TestCase("    l\r    l")]
-        [TestCase("    l\r    l\n")]
-        [TestCase("    l\r    l\r")]
-        [TestCase("    l\r    l\r\n")]
-
-        [TestCase("    l\r\n    l")]
-        [TestCase("    l\r\n    l\n")]
-        [TestCase("    l\r\n    l\r")]
-        [TestCase("    l\r\n    l\r\n")]
-        public void TestNewline(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("    l\n\n    l\n")]
-        [TestCase("    l\n\n\n    l\n")]
-        public void TestNewlinesInBetweenResultInOneCodeBlock(string value)
-        {
-            var pipelineBuilder = new MarkdownPipelineBuilder();
-            pipelineBuilder.EnableTrackTrivia();
-            MarkdownPipeline pipeline = pipelineBuilder.Build();
-            var markdownDocument = Markdown.Parse(value, pipeline);
-
-            Assert.AreEqual(1, markdownDocument.Count);
-        }
-
-        [TestCase("    l\n\np")]
-        [TestCase("    l\n\n\np")]
-        [TestCase("    l\n\n\n\np")]
-        public void TestParagraph(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("    l\n\np")]
+    [TestCase("    l\n\n\np")]
+    [TestCase("    l\n\n\n\np")]
+    public void TestParagraph(string value)
+    {
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestLinkReferenceDefinition.cs

@@ -1,214 +1,212 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestLinkReferenceDefinition
 {
-    [TestFixture]
-    public class TestLinkReferenceDefinition
+    [TestCase(@"[a]: /r")]
+    [TestCase(@" [a]: /r")]
+    [TestCase(@"  [a]: /r")]
+    [TestCase(@"   [a]: /r")]
+
+    [TestCase(@"[a]:  /r")]
+    [TestCase(@" [a]:  /r")]
+    [TestCase(@"  [a]:  /r")]
+    [TestCase(@"   [a]:  /r")]
+
+    [TestCase(@"[a]:  /r ")]
+    [TestCase(@" [a]:  /r ")]
+    [TestCase(@"  [a]:  /r ")]
+    [TestCase(@"   [a]:  /r ")]
+
+    [TestCase(@"[a]: /r ""l""")]
+    [TestCase(@"[a]:  /r ""l""")]
+    [TestCase(@"[a]: /r  ""l""")]
+    [TestCase(@"[a]: /r ""l"" ")]
+    [TestCase(@"[a]:  /r  ""l""")]
+    [TestCase(@"[a]:  /r  ""l"" ")]
+
+    [TestCase(@" [a]: /r ""l""")]
+    [TestCase(@" [a]:  /r ""l""")]
+    [TestCase(@" [a]: /r  ""l""")]
+    [TestCase(@" [a]: /r ""l"" ")]
+    [TestCase(@" [a]:  /r  ""l""")]
+    [TestCase(@" [a]:  /r  ""l"" ")]
+
+    [TestCase(@"  [a]: /r ""l""")]
+    [TestCase(@"  [a]:  /r ""l""")]
+    [TestCase(@"  [a]: /r  ""l""")]
+    [TestCase(@"  [a]: /r ""l"" ")]
+    [TestCase(@"  [a]:  /r  ""l""")]
+    [TestCase(@"  [a]:  /r  ""l"" ")]
+
+    [TestCase(@"   [a]: /r ""l""")]
+    [TestCase(@"   [a]:  /r ""l""")]
+    [TestCase(@"   [a]: /r  ""l""")]
+    [TestCase(@"   [a]: /r ""l"" ")]
+    [TestCase(@"   [a]:  /r  ""l""")]
+    [TestCase(@"   [a]:  /r  ""l"" ")]
+
+    [TestCase("[a]:\t/r")]
+    [TestCase("[a]:\t/r\t")]
+    [TestCase("[a]:\t/r\t\"l\"")]
+    [TestCase("[a]:\t/r\t\"l\"\t")]
+
+    [TestCase("[a]: \t/r")]
+    [TestCase("[a]: \t/r\t")]
+    [TestCase("[a]: \t/r\t\"l\"")]
+    [TestCase("[a]: \t/r\t\"l\"\t")]
+
+    [TestCase("[a]:\t /r")]
+    [TestCase("[a]:\t /r\t")]
+    [TestCase("[a]:\t /r\t\"l\"")]
+    [TestCase("[a]:\t /r\t\"l\"\t")]
+
+    [TestCase("[a]: \t /r")]
+    [TestCase("[a]: \t /r\t")]
+    [TestCase("[a]: \t /r\t\"l\"")]
+    [TestCase("[a]: \t /r\t\"l\"\t")]
+
+    [TestCase("[a]:\t/r \t")]
+    [TestCase("[a]:\t/r \t\"l\"")]
+    [TestCase("[a]:\t/r \t\"l\"\t")]
+
+    [TestCase("[a]: \t/r")]
+    [TestCase("[a]: \t/r \t")]
+    [TestCase("[a]: \t/r \t\"l\"")]
+    [TestCase("[a]: \t/r \t\"l\"\t")]
+
+    [TestCase("[a]:\t /r")]
+    [TestCase("[a]:\t /r \t")]
+    [TestCase("[a]:\t /r \t\"l\"")]
+    [TestCase("[a]:\t /r \t\"l\"\t")]
+
+    [TestCase("[a]: \t /r")]
+    [TestCase("[a]: \t /r \t")]
+    [TestCase("[a]: \t /r \t\"l\"")]
+    [TestCase("[a]: \t /r \t\"l\"\t")]
+
+    [TestCase("[a]:\t/r\t ")]
+    [TestCase("[a]:\t/r\t \"l\"")]
+    [TestCase("[a]:\t/r\t \"l\"\t")]
+
+    [TestCase("[a]: \t/r")]
+    [TestCase("[a]: \t/r\t ")]
+    [TestCase("[a]: \t/r\t \"l\"")]
+    [TestCase("[a]: \t/r\t \"l\"\t")]
+
+    [TestCase("[a]:\t /r")]
+    [TestCase("[a]:\t /r\t ")]
+    [TestCase("[a]:\t /r\t \"l\"")]
+    [TestCase("[a]:\t /r\t \"l\"\t")]
+
+    [TestCase("[a]: \t /r")]
+    [TestCase("[a]: \t /r\t ")]
+    [TestCase("[a]: \t /r\t \"l\"")]
+    [TestCase("[a]: \t /r\t \"l\"\t")]
+
+    [TestCase("[a]:\t/r \t ")]
+    [TestCase("[a]:\t/r \t \"l\"")]
+    [TestCase("[a]:\t/r \t \"l\"\t")]
+
+    [TestCase("[a]: \t/r")]
+    [TestCase("[a]: \t/r \t ")]
+    [TestCase("[a]: \t/r \t \"l\"")]
+    [TestCase("[a]: \t/r \t \"l\"\t")]
+
+    [TestCase("[a]:\t /r")]
+    [TestCase("[a]:\t /r \t ")]
+    [TestCase("[a]:\t /r \t \"l\"")]
+    [TestCase("[a]:\t /r \t \"l\"\t")]
+
+    [TestCase("[a]: \t /r")]
+    [TestCase("[a]: \t /r \t ")]
+    [TestCase("[a]: \t /r \t \"l\"")]
+    [TestCase("[a]: \t /r \t \"l\"\t")]
+    public void Test(string value)
     {
-        [TestCase(@"[a]: /r")]
-        [TestCase(@" [a]: /r")]
-        [TestCase(@"  [a]: /r")]
-        [TestCase(@"   [a]: /r")]
+        RoundTrip(value);
+    }
 
-        [TestCase(@"[a]:  /r")]
-        [TestCase(@" [a]:  /r")]
-        [TestCase(@"  [a]:  /r")]
-        [TestCase(@"   [a]:  /r")]
+    [TestCase("[a]: /r\n[b]: /r\n")]
+    [TestCase("[a]: /r\n[b]: /r\n[c] /r\n")]
+    public void TestMultiple(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase(@"[a]:  /r ")]
-        [TestCase(@" [a]:  /r ")]
-        [TestCase(@"  [a]:  /r ")]
-        [TestCase(@"   [a]:  /r ")]
+    [TestCase("[a]:\f/r\f\"l\"")]
+    [TestCase("[a]:\v/r\v\"l\"")]
+    public void TestUncommonWhitespace(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase(@"[a]: /r ""l""")]
-        [TestCase(@"[a]:  /r ""l""")]
-        [TestCase(@"[a]: /r  ""l""")]
-        [TestCase(@"[a]: /r ""l"" ")]
-        [TestCase(@"[a]:  /r  ""l""")]
-        [TestCase(@"[a]:  /r  ""l"" ")]
+    [TestCase("[a]:\n/r\n\"t\"")]
+    [TestCase("[a]:\n/r\r\"t\"")]
+    [TestCase("[a]:\n/r\r\n\"t\"")]
 
-        [TestCase(@" [a]: /r ""l""")]
-        [TestCase(@" [a]:  /r ""l""")]
-        [TestCase(@" [a]: /r  ""l""")]
-        [TestCase(@" [a]: /r ""l"" ")]
-        [TestCase(@" [a]:  /r  ""l""")]
-        [TestCase(@" [a]:  /r  ""l"" ")]
+    [TestCase("[a]:\r/r\n\"t\"")]
+    [TestCase("[a]:\r/r\r\"t\"")]
+    [TestCase("[a]:\r/r\r\n\"t\"")]
 
-        [TestCase(@"  [a]: /r ""l""")]
-        [TestCase(@"  [a]:  /r ""l""")]
-        [TestCase(@"  [a]: /r  ""l""")]
-        [TestCase(@"  [a]: /r ""l"" ")]
-        [TestCase(@"  [a]:  /r  ""l""")]
-        [TestCase(@"  [a]:  /r  ""l"" ")]
+    [TestCase("[a]:\r\n/r\n\"t\"")]
+    [TestCase("[a]:\r\n/r\r\"t\"")]
+    [TestCase("[a]:\r\n/r\r\n\"t\"")]
 
-        [TestCase(@"   [a]: /r ""l""")]
-        [TestCase(@"   [a]:  /r ""l""")]
-        [TestCase(@"   [a]: /r  ""l""")]
-        [TestCase(@"   [a]: /r ""l"" ")]
-        [TestCase(@"   [a]:  /r  ""l""")]
-        [TestCase(@"   [a]:  /r  ""l"" ")]
+    [TestCase("[a]:\n/r\n\"t\nt\"")]
+    [TestCase("[a]:\n/r\n\"t\rt\"")]
+    [TestCase("[a]:\n/r\n\"t\r\nt\"")]
 
-        [TestCase("[a]:\t/r")]
-        [TestCase("[a]:\t/r\t")]
-        [TestCase("[a]:\t/r\t\"l\"")]
-        [TestCase("[a]:\t/r\t\"l\"\t")]
+    [TestCase("[a]:\r\n  /r\t \n \t \"t\r\nt\"   ")]
+    [TestCase("[a]:\n/r\n\n[a],")]
+    [TestCase("[a]: /r\n[b]: /r\n\n[a],")]
+    public void TestNewlines(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("[a]: \t/r")]
-        [TestCase("[a]: \t/r\t")]
-        [TestCase("[a]: \t/r\t\"l\"")]
-        [TestCase("[a]: \t/r\t\"l\"\t")]
+    [TestCase("[ a]: /r")]
+    [TestCase("[a ]: /r")]
+    [TestCase("[ a ]: /r")]
+    [TestCase("[  a]: /r")]
+    [TestCase("[  a ]: /r")]
+    [TestCase("[a  ]: /r")]
+    [TestCase("[ a  ]: /r")]
+    [TestCase("[  a  ]: /r")]
+    [TestCase("[a a]: /r")]
+    [TestCase("[a\va]: /r")]
+    [TestCase("[a\fa]: /r")]
+    [TestCase("[a\ta]: /r")]
+    [TestCase("[\va]: /r")]
+    [TestCase("[\fa]: /r")]
+    [TestCase("[\ta]: /r")]
+    [TestCase(@"[\]]: /r")]
+    public void TestLabel(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("[a]:\t /r")]
-        [TestCase("[a]:\t /r\t")]
-        [TestCase("[a]:\t /r\t\"l\"")]
-        [TestCase("[a]:\t /r\t\"l\"\t")]
+    [TestCase("[a]: /r ()")]
+    [TestCase("[a]: /r (t)")]
+    [TestCase("[a]: /r ( t)")]
+    [TestCase("[a]: /r (t )")]
+    [TestCase("[a]: /r ( t )")]
 
-        [TestCase("[a]: \t /r")]
-        [TestCase("[a]: \t /r\t")]
-        [TestCase("[a]: \t /r\t\"l\"")]
-        [TestCase("[a]: \t /r\t\"l\"\t")]
+    [TestCase("[a]: /r ''")]
+    [TestCase("[a]: /r 't'")]
+    [TestCase("[a]: /r ' t'")]
+    [TestCase("[a]: /r 't '")]
+    [TestCase("[a]: /r ' t '")]
+    public void Test_Title(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("[a]:\t/r \t")]
-        [TestCase("[a]:\t/r \t\"l\"")]
-        [TestCase("[a]:\t/r \t\"l\"\t")]
-
-        [TestCase("[a]: \t/r")]
-        [TestCase("[a]: \t/r \t")]
-        [TestCase("[a]: \t/r \t\"l\"")]
-        [TestCase("[a]: \t/r \t\"l\"\t")]
-
-        [TestCase("[a]:\t /r")]
-        [TestCase("[a]:\t /r \t")]
-        [TestCase("[a]:\t /r \t\"l\"")]
-        [TestCase("[a]:\t /r \t\"l\"\t")]
-
-        [TestCase("[a]: \t /r")]
-        [TestCase("[a]: \t /r \t")]
-        [TestCase("[a]: \t /r \t\"l\"")]
-        [TestCase("[a]: \t /r \t\"l\"\t")]
-
-        [TestCase("[a]:\t/r\t ")]
-        [TestCase("[a]:\t/r\t \"l\"")]
-        [TestCase("[a]:\t/r\t \"l\"\t")]
-
-        [TestCase("[a]: \t/r")]
-        [TestCase("[a]: \t/r\t ")]
-        [TestCase("[a]: \t/r\t \"l\"")]
-        [TestCase("[a]: \t/r\t \"l\"\t")]
-
-        [TestCase("[a]:\t /r")]
-        [TestCase("[a]:\t /r\t ")]
-        [TestCase("[a]:\t /r\t \"l\"")]
-        [TestCase("[a]:\t /r\t \"l\"\t")]
-
-        [TestCase("[a]: \t /r")]
-        [TestCase("[a]: \t /r\t ")]
-        [TestCase("[a]: \t /r\t \"l\"")]
-        [TestCase("[a]: \t /r\t \"l\"\t")]
-
-        [TestCase("[a]:\t/r \t ")]
-        [TestCase("[a]:\t/r \t \"l\"")]
-        [TestCase("[a]:\t/r \t \"l\"\t")]
-
-        [TestCase("[a]: \t/r")]
-        [TestCase("[a]: \t/r \t ")]
-        [TestCase("[a]: \t/r \t \"l\"")]
-        [TestCase("[a]: \t/r \t \"l\"\t")]
-
-        [TestCase("[a]:\t /r")]
-        [TestCase("[a]:\t /r \t ")]
-        [TestCase("[a]:\t /r \t \"l\"")]
-        [TestCase("[a]:\t /r \t \"l\"\t")]
-
-        [TestCase("[a]: \t /r")]
-        [TestCase("[a]: \t /r \t ")]
-        [TestCase("[a]: \t /r \t \"l\"")]
-        [TestCase("[a]: \t /r \t \"l\"\t")]
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("[a]: /r\n[b]: /r\n")]
-        [TestCase("[a]: /r\n[b]: /r\n[c] /r\n")]
-        public void TestMultiple(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("[a]:\f/r\f\"l\"")]
-        [TestCase("[a]:\v/r\v\"l\"")]
-        public void TestUncommonWhitespace(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("[a]:\n/r\n\"t\"")]
-        [TestCase("[a]:\n/r\r\"t\"")]
-        [TestCase("[a]:\n/r\r\n\"t\"")]
-
-        [TestCase("[a]:\r/r\n\"t\"")]
-        [TestCase("[a]:\r/r\r\"t\"")]
-        [TestCase("[a]:\r/r\r\n\"t\"")]
-
-        [TestCase("[a]:\r\n/r\n\"t\"")]
-        [TestCase("[a]:\r\n/r\r\"t\"")]
-        [TestCase("[a]:\r\n/r\r\n\"t\"")]
-
-        [TestCase("[a]:\n/r\n\"t\nt\"")]
-        [TestCase("[a]:\n/r\n\"t\rt\"")]
-        [TestCase("[a]:\n/r\n\"t\r\nt\"")]
-
-        [TestCase("[a]:\r\n  /r\t \n \t \"t\r\nt\"   ")]
-        [TestCase("[a]:\n/r\n\n[a],")]
-        [TestCase("[a]: /r\n[b]: /r\n\n[a],")]
-        public void TestNewlines(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("[ a]: /r")]
-        [TestCase("[a ]: /r")]
-        [TestCase("[ a ]: /r")]
-        [TestCase("[  a]: /r")]
-        [TestCase("[  a ]: /r")]
-        [TestCase("[a  ]: /r")]
-        [TestCase("[ a  ]: /r")]
-        [TestCase("[  a  ]: /r")]
-        [TestCase("[a a]: /r")]
-        [TestCase("[a\va]: /r")]
-        [TestCase("[a\fa]: /r")]
-        [TestCase("[a\ta]: /r")]
-        [TestCase("[\va]: /r")]
-        [TestCase("[\fa]: /r")]
-        [TestCase("[\ta]: /r")]
-        [TestCase(@"[\]]: /r")]
-        public void TestLabel(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("[a]: /r ()")]
-        [TestCase("[a]: /r (t)")]
-        [TestCase("[a]: /r ( t)")]
-        [TestCase("[a]: /r (t )")]
-        [TestCase("[a]: /r ( t )")]
-
-        [TestCase("[a]: /r ''")]
-        [TestCase("[a]: /r 't'")]
-        [TestCase("[a]: /r ' t'")]
-        [TestCase("[a]: /r 't '")]
-        [TestCase("[a]: /r ' t '")]
-        public void Test_Title(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("[a]: /r\n===\n[a]")]
-        public void TestSetextHeader(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("[a]: /r\n===\n[a]")]
+    public void TestSetextHeader(string value)
+    {
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestNoBlocksFoundBlock.cs

@@ -1,23 +1,21 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestNoBlocksFoundBlock
 {
-    [TestFixture]
-    public class TestNoBlocksFoundBlock
+    [TestCase("\r")]
+    [TestCase("\n")]
+    [TestCase("\r\n")]
+    [TestCase("\t")]
+    [TestCase("\v")]
+    [TestCase("\f")]
+    [TestCase(" ")]
+    [TestCase("  ")]
+    [TestCase("   ")]
+    public void Test(string value)
     {
-        [TestCase("\r")]
-        [TestCase("\n")]
-        [TestCase("\r\n")]
-        [TestCase("\t")]
-        [TestCase("\v")]
-        [TestCase("\f")]
-        [TestCase(" ")]
-        [TestCase("  ")]
-        [TestCase("   ")]
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestOrderedList.cs

@@ -1,191 +1,189 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestOrderedList
 {
-    [TestFixture]
-    public class TestOrderedList
+    [TestCase("1. i")]
+    [TestCase("1.  i")]
+    [TestCase("1. i ")]
+    [TestCase("1.  i ")]
+    [TestCase("1.  i  ")]
+
+    [TestCase(" 1. i")]
+    [TestCase(" 1.  i")]
+    [TestCase(" 1. i ")]
+    [TestCase(" 1.  i ")]
+    [TestCase(" 1.  i  ")]
+
+    [TestCase("  1. i")]
+    [TestCase("  1.  i")]
+    [TestCase("  1. i ")]
+    [TestCase("  1.  i ")]
+    [TestCase("  1.  i  ")]
+
+    [TestCase("   1. i")]
+    [TestCase("   1.  i")]
+    [TestCase("   1. i ")]
+    [TestCase("   1.  i ")]
+    [TestCase("   1.  i  ")]
+
+    [TestCase("1. i\n")]
+    [TestCase("1.  i\n")]
+    [TestCase("1. i \n")]
+    [TestCase("1.  i \n")]
+    [TestCase("1.  i  \n")]
+
+    [TestCase(" 1. i\n")]
+    [TestCase(" 1.  i\n")]
+    [TestCase(" 1. i \n")]
+    [TestCase(" 1.  i \n")]
+    [TestCase(" 1.  i  \n")]
+
+    [TestCase("  1. i\n")]
+    [TestCase("  1.  i\n")]
+    [TestCase("  1. i \n")]
+    [TestCase("  1.  i \n")]
+    [TestCase("  1.  i  \n")]
+
+    [TestCase("   1. i\n")]
+    [TestCase("   1.  i\n")]
+    [TestCase("   1. i \n")]
+    [TestCase("   1.  i \n")]
+    [TestCase("   1.  i  \n")]
+
+    [TestCase("1. i\n2. j")]
+    [TestCase("1.  i\n2. j")]
+    [TestCase("1. i \n2. j")]
+    [TestCase("1.  i \n2. j")]
+    [TestCase("1.  i  \n2. j")]
+
+    [TestCase(" 1. i\n2. j")]
+    [TestCase(" 1.  i\n2. j")]
+    [TestCase(" 1. i \n2. j")]
+    [TestCase(" 1.  i \n2. j")]
+    [TestCase(" 1.  i  \n2. j")]
+
+    [TestCase("  1. i\n2. j")]
+    [TestCase("  1.  i\n2. j")]
+    [TestCase("  1. i \n2. j")]
+    [TestCase("  1.  i \n2. j")]
+    [TestCase("  1.  i  \n2. j")]
+
+    [TestCase("   1. i\n2. j")]
+    [TestCase("   1.  i\n2. j")]
+    [TestCase("   1. i \n2. j")]
+    [TestCase("   1.  i \n2. j")]
+    [TestCase("   1.  i  \n2. j")]
+
+    [TestCase("1. i\n2. j\n")]
+    [TestCase("1.  i\n2. j\n")]
+    [TestCase("1. i \n2. j\n")]
+    [TestCase("1.  i \n2. j\n")]
+    [TestCase("1.  i  \n2. j\n")]
+
+    [TestCase(" 1. i\n2. j\n")]
+    [TestCase(" 1.  i\n2. j\n")]
+    [TestCase(" 1. i \n2. j\n")]
+    [TestCase(" 1.  i \n2. j\n")]
+    [TestCase(" 1.  i  \n2. j\n")]
+
+    [TestCase("  1. i\n2. j\n")]
+    [TestCase("  1.  i\n2. j\n")]
+    [TestCase("  1. i \n2. j\n")]
+    [TestCase("  1.  i \n2. j\n")]
+    [TestCase("  1.  i  \n2. j\n")]
+
+    [TestCase("   1. i\n2. j\n")]
+    [TestCase("   1.  i\n2. j\n")]
+    [TestCase("   1. i \n2. j\n")]
+    [TestCase("   1.  i \n2. j\n")]
+    [TestCase("   1.  i  \n2. j\n")]
+
+    [TestCase("1. i\n2. j\n3. k")]
+    [TestCase("1. i\n2. j\n3. k\n")]
+    public void Test(string value)
     {
-        [TestCase("1. i")]
-        [TestCase("1.  i")]
-        [TestCase("1. i ")]
-        [TestCase("1.  i ")]
-        [TestCase("1.  i  ")]
+        RoundTrip(value);
+    }
 
-        [TestCase(" 1. i")]
-        [TestCase(" 1.  i")]
-        [TestCase(" 1. i ")]
-        [TestCase(" 1.  i ")]
-        [TestCase(" 1.  i  ")]
-
-        [TestCase("  1. i")]
-        [TestCase("  1.  i")]
-        [TestCase("  1. i ")]
-        [TestCase("  1.  i ")]
-        [TestCase("  1.  i  ")]
-
-        [TestCase("   1. i")]
-        [TestCase("   1.  i")]
-        [TestCase("   1. i ")]
-        [TestCase("   1.  i ")]
-        [TestCase("   1.  i  ")]
-
-        [TestCase("1. i\n")]
-        [TestCase("1.  i\n")]
-        [TestCase("1. i \n")]
-        [TestCase("1.  i \n")]
-        [TestCase("1.  i  \n")]
-
-        [TestCase(" 1. i\n")]
-        [TestCase(" 1.  i\n")]
-        [TestCase(" 1. i \n")]
-        [TestCase(" 1.  i \n")]
-        [TestCase(" 1.  i  \n")]
-
-        [TestCase("  1. i\n")]
-        [TestCase("  1.  i\n")]
-        [TestCase("  1. i \n")]
-        [TestCase("  1.  i \n")]
-        [TestCase("  1.  i  \n")]
-
-        [TestCase("   1. i\n")]
-        [TestCase("   1.  i\n")]
-        [TestCase("   1. i \n")]
-        [TestCase("   1.  i \n")]
-        [TestCase("   1.  i  \n")]
-
-        [TestCase("1. i\n2. j")]
-        [TestCase("1.  i\n2. j")]
-        [TestCase("1. i \n2. j")]
-        [TestCase("1.  i \n2. j")]
-        [TestCase("1.  i  \n2. j")]
-
-        [TestCase(" 1. i\n2. j")]
-        [TestCase(" 1.  i\n2. j")]
-        [TestCase(" 1. i \n2. j")]
-        [TestCase(" 1.  i \n2. j")]
-        [TestCase(" 1.  i  \n2. j")]
-
-        [TestCase("  1. i\n2. j")]
-        [TestCase("  1.  i\n2. j")]
-        [TestCase("  1. i \n2. j")]
-        [TestCase("  1.  i \n2. j")]
-        [TestCase("  1.  i  \n2. j")]
-
-        [TestCase("   1. i\n2. j")]
-        [TestCase("   1.  i\n2. j")]
-        [TestCase("   1. i \n2. j")]
-        [TestCase("   1.  i \n2. j")]
-        [TestCase("   1.  i  \n2. j")]
-
-        [TestCase("1. i\n2. j\n")]
-        [TestCase("1.  i\n2. j\n")]
-        [TestCase("1. i \n2. j\n")]
-        [TestCase("1.  i \n2. j\n")]
-        [TestCase("1.  i  \n2. j\n")]
-
-        [TestCase(" 1. i\n2. j\n")]
-        [TestCase(" 1.  i\n2. j\n")]
-        [TestCase(" 1. i \n2. j\n")]
-        [TestCase(" 1.  i \n2. j\n")]
-        [TestCase(" 1.  i  \n2. j\n")]
-
-        [TestCase("  1. i\n2. j\n")]
-        [TestCase("  1.  i\n2. j\n")]
-        [TestCase("  1. i \n2. j\n")]
-        [TestCase("  1.  i \n2. j\n")]
-        [TestCase("  1.  i  \n2. j\n")]
-
-        [TestCase("   1. i\n2. j\n")]
-        [TestCase("   1.  i\n2. j\n")]
-        [TestCase("   1. i \n2. j\n")]
-        [TestCase("   1.  i \n2. j\n")]
-        [TestCase("   1.  i  \n2. j\n")]
-
-        [TestCase("1. i\n2. j\n3. k")]
-        [TestCase("1. i\n2. j\n3. k\n")]
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("10. i")]
-        [TestCase("11. i")]
-        [TestCase("10. i\n12. i")]
-        [TestCase("2. i\n3. i")]
-        public void Test_MoreThenOneStart(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("10. i")]
+    [TestCase("11. i")]
+    [TestCase("10. i\n12. i")]
+    [TestCase("2. i\n3. i")]
+    public void Test_MoreThenOneStart(string value)
+    {
+        RoundTrip(value);
+    }
 
 
-        [TestCase("\n1. i")]
-        [TestCase("\r1. i")]
-        [TestCase("\r\n1. i")]
+    [TestCase("\n1. i")]
+    [TestCase("\r1. i")]
+    [TestCase("\r\n1. i")]
 
-        [TestCase("\n1. i\n")]
-        [TestCase("\r1. i\n")]
-        [TestCase("\r\n1. i\n")]
+    [TestCase("\n1. i\n")]
+    [TestCase("\r1. i\n")]
+    [TestCase("\r\n1. i\n")]
 
-        [TestCase("\n1. i\r")]
-        [TestCase("\r1. i\r")]
-        [TestCase("\r\n1. i\r")]
+    [TestCase("\n1. i\r")]
+    [TestCase("\r1. i\r")]
+    [TestCase("\r\n1. i\r")]
 
-        [TestCase("\n1. i\r\n")]
-        [TestCase("\r1. i\r\n")]
-        [TestCase("\r\n1. i\r\n")]
+    [TestCase("\n1. i\r\n")]
+    [TestCase("\r1. i\r\n")]
+    [TestCase("\r\n1. i\r\n")]
 
-        [TestCase("1. i\n2. i")]
-        [TestCase("\n1. i\n2. i")]
-        [TestCase("\r1. i\n2. i")]
-        [TestCase("\r\n1. i\n2. i")]
+    [TestCase("1. i\n2. i")]
+    [TestCase("\n1. i\n2. i")]
+    [TestCase("\r1. i\n2. i")]
+    [TestCase("\r\n1. i\n2. i")]
 
-        [TestCase("1. i\r2. i")]
-        [TestCase("\n1. i\r2. i")]
-        [TestCase("\r1. i\r2. i")]
-        [TestCase("\r\n1. i\r2. i")]
+    [TestCase("1. i\r2. i")]
+    [TestCase("\n1. i\r2. i")]
+    [TestCase("\r1. i\r2. i")]
+    [TestCase("\r\n1. i\r2. i")]
 
-        [TestCase("1. i\r\n2. i")]
-        [TestCase("\n1. i\r\n2. i")]
-        [TestCase("\r1. i\r\n2. i")]
-        [TestCase("\r\n1. i\r\n2. i")]
+    [TestCase("1. i\r\n2. i")]
+    [TestCase("\n1. i\r\n2. i")]
+    [TestCase("\r1. i\r\n2. i")]
+    [TestCase("\r\n1. i\r\n2. i")]
 
-        [TestCase("1. i\n2. i\n")]
-        [TestCase("\n1. i\n2. i\n")]
-        [TestCase("\r1. i\n2. i\n")]
-        [TestCase("\r\n1. i\n2. i\n")]
+    [TestCase("1. i\n2. i\n")]
+    [TestCase("\n1. i\n2. i\n")]
+    [TestCase("\r1. i\n2. i\n")]
+    [TestCase("\r\n1. i\n2. i\n")]
 
-        [TestCase("1. i\r2. i\r")]
-        [TestCase("\n1. i\r2. i\r")]
-        [TestCase("\r1. i\r2. i\r")]
-        [TestCase("\r\n1. i\r2. i\r")]
+    [TestCase("1. i\r2. i\r")]
+    [TestCase("\n1. i\r2. i\r")]
+    [TestCase("\r1. i\r2. i\r")]
+    [TestCase("\r\n1. i\r2. i\r")]
 
-        [TestCase("1. i\r\n2. i\r\n")]
-        [TestCase("\n1. i\r\n2. i\r\n")]
-        [TestCase("\r1. i\r\n2. i\r\n")]
-        [TestCase("\r\n1. i\r\n2. i\r\n")]
-        public void TestNewline(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("1. i\r\n2. i\r\n")]
+    [TestCase("\n1. i\r\n2. i\r\n")]
+    [TestCase("\r1. i\r\n2. i\r\n")]
+    [TestCase("\r\n1. i\r\n2. i\r\n")]
+    public void TestNewline(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("1. i\n  1. i")]
-        [TestCase("1. i\n  1. i\n")]
-        [TestCase("1. i\n  1. i\n  2. i")]
-        [TestCase("1. i\n  2. i\n  3. i")]
+    [TestCase("1. i\n  1. i")]
+    [TestCase("1. i\n  1. i\n")]
+    [TestCase("1. i\n  1. i\n  2. i")]
+    [TestCase("1. i\n  2. i\n  3. i")]
 
-        [TestCase("1. i\n\t1. i")]
-        [TestCase("1. i\n\t1. i\n2. i")]
-        public void TestMultipleLevels(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("1. i\n\t1. i")]
+    [TestCase("1. i\n\t1. i\n2. i")]
+    public void TestMultipleLevels(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("1.     c")]
-        [TestCase("1.      c")]
-        public void Test_IndentedCodeBlock(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("1.     c")]
+    [TestCase("1.      c")]
+    public void Test_IndentedCodeBlock(string value)
+    {
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestParagraph.cs

@@ -1,247 +1,245 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestParagraph
 {
-    [TestFixture]
-    public class TestParagraph
+    [TestCase("p")]
+    [TestCase(" p")]
+    [TestCase("p ")]
+    [TestCase(" p ")]
+
+    [TestCase("p\np")]
+    [TestCase(" p\np")]
+    [TestCase("p \np")]
+    [TestCase(" p \np")]
+
+    [TestCase("p\n p")]
+    [TestCase(" p\n p")]
+    [TestCase("p \n p")]
+    [TestCase(" p \n p")]
+
+    [TestCase("p\np ")]
+    [TestCase(" p\np ")]
+    [TestCase("p \np ")]
+    [TestCase(" p \np ")]
+
+    [TestCase("p\n\n p ")]
+    [TestCase(" p\n\n p ")]
+    [TestCase("p \n\n p ")]
+    [TestCase(" p \n\n p ")]
+
+    [TestCase("p\n\np")]
+    [TestCase(" p\n\np")]
+    [TestCase("p \n\np")]
+    [TestCase(" p \n\np")]
+
+    [TestCase("p\n\n p")]
+    [TestCase(" p\n\n p")]
+    [TestCase("p \n\n p")]
+    [TestCase(" p \n\n p")]
+
+    [TestCase("p\n\np ")]
+    [TestCase(" p\n\np ")]
+    [TestCase("p \n\np ")]
+    [TestCase(" p \n\np ")]
+
+    [TestCase("p\n\n p ")]
+    [TestCase(" p\n\n p ")]
+    [TestCase("p \n\n p ")]
+    [TestCase(" p \n\n p ")]
+
+    [TestCase("\np")]
+    [TestCase("\n p")]
+    [TestCase("\np ")]
+    [TestCase("\n p ")]
+
+    [TestCase("\np\np")]
+    [TestCase("\n p\np")]
+    [TestCase("\np \np")]
+    [TestCase("\n p \np")]
+
+    [TestCase("\np\n p")]
+    [TestCase("\n p\n p")]
+    [TestCase("\np \n p")]
+    [TestCase("\n p \n p")]
+
+    [TestCase("\np\np ")]
+    [TestCase("\n p\np ")]
+    [TestCase("\np \np ")]
+    [TestCase("\n p \np ")]
+
+    [TestCase("\np\n\n p ")]
+    [TestCase("\n p\n\n p ")]
+    [TestCase("\np \n\n p ")]
+    [TestCase("\n p \n\n p ")]
+
+    [TestCase("\np\n\np")]
+    [TestCase("\n p\n\np")]
+    [TestCase("\np \n\np")]
+    [TestCase("\n p \n\np")]
+
+    [TestCase("\np\n\n p")]
+    [TestCase("\n p\n\n p")]
+    [TestCase("\np \n\n p")]
+    [TestCase("\n p \n\n p")]
+
+    [TestCase("\np\n\np ")]
+    [TestCase("\n p\n\np ")]
+    [TestCase("\np \n\np ")]
+    [TestCase("\n p \n\np ")]
+
+    [TestCase("\np\n\n p ")]
+    [TestCase("\n p\n\n p ")]
+    [TestCase("\np \n\n p ")]
+    [TestCase("\n p \n\n p ")]
+
+    [TestCase("p  p")]
+    [TestCase("p\tp")]
+    [TestCase("p \tp")]
+    [TestCase("p \t p")]
+    [TestCase("p \tp")]
+
+    // special cases
+    [TestCase(" p \n\n\n\n p \n\n")]
+    [TestCase("\n\np")]
+    [TestCase("p\n")]
+    [TestCase("p\n\n")]
+    [TestCase("p\np\n p")]
+    [TestCase("p\np\n p\n p")]
+    public void Test(string value)
     {
-        [TestCase("p")]
-        [TestCase(" p")]
-        [TestCase("p ")]
-        [TestCase(" p ")]
-
-        [TestCase("p\np")]
-        [TestCase(" p\np")]
-        [TestCase("p \np")]
-        [TestCase(" p \np")]
-
-        [TestCase("p\n p")]
-        [TestCase(" p\n p")]
-        [TestCase("p \n p")]
-        [TestCase(" p \n p")]
-
-        [TestCase("p\np ")]
-        [TestCase(" p\np ")]
-        [TestCase("p \np ")]
-        [TestCase(" p \np ")]
-
-        [TestCase("p\n\n p ")]
-        [TestCase(" p\n\n p ")]
-        [TestCase("p \n\n p ")]
-        [TestCase(" p \n\n p ")]
-
-        [TestCase("p\n\np")]
-        [TestCase(" p\n\np")]
-        [TestCase("p \n\np")]
-        [TestCase(" p \n\np")]
-
-        [TestCase("p\n\n p")]
-        [TestCase(" p\n\n p")]
-        [TestCase("p \n\n p")]
-        [TestCase(" p \n\n p")]
-
-        [TestCase("p\n\np ")]
-        [TestCase(" p\n\np ")]
-        [TestCase("p \n\np ")]
-        [TestCase(" p \n\np ")]
-
-        [TestCase("p\n\n p ")]
-        [TestCase(" p\n\n p ")]
-        [TestCase("p \n\n p ")]
-        [TestCase(" p \n\n p ")]
-
-        [TestCase("\np")]
-        [TestCase("\n p")]
-        [TestCase("\np ")]
-        [TestCase("\n p ")]
-
-        [TestCase("\np\np")]
-        [TestCase("\n p\np")]
-        [TestCase("\np \np")]
-        [TestCase("\n p \np")]
-
-        [TestCase("\np\n p")]
-        [TestCase("\n p\n p")]
-        [TestCase("\np \n p")]
-        [TestCase("\n p \n p")]
-
-        [TestCase("\np\np ")]
-        [TestCase("\n p\np ")]
-        [TestCase("\np \np ")]
-        [TestCase("\n p \np ")]
-
-        [TestCase("\np\n\n p ")]
-        [TestCase("\n p\n\n p ")]
-        [TestCase("\np \n\n p ")]
-        [TestCase("\n p \n\n p ")]
-
-        [TestCase("\np\n\np")]
-        [TestCase("\n p\n\np")]
-        [TestCase("\np \n\np")]
-        [TestCase("\n p \n\np")]
-
-        [TestCase("\np\n\n p")]
-        [TestCase("\n p\n\n p")]
-        [TestCase("\np \n\n p")]
-        [TestCase("\n p \n\n p")]
-
-        [TestCase("\np\n\np ")]
-        [TestCase("\n p\n\np ")]
-        [TestCase("\np \n\np ")]
-        [TestCase("\n p \n\np ")]
-
-        [TestCase("\np\n\n p ")]
-        [TestCase("\n p\n\n p ")]
-        [TestCase("\np \n\n p ")]
-        [TestCase("\n p \n\n p ")]
-
-        [TestCase("p  p")]
-        [TestCase("p\tp")]
-        [TestCase("p \tp")]
-        [TestCase("p \t p")]
-        [TestCase("p \tp")]
-
-        // special cases
-        [TestCase(" p \n\n\n\n p \n\n")]
-        [TestCase("\n\np")]
-        [TestCase("p\n")]
-        [TestCase("p\n\n")]
-        [TestCase("p\np\n p")]
-        [TestCase("p\np\n p\n p")]
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
+        RoundTrip(value);
+    }
 
 
-        [TestCase("\n")]
-        [TestCase("\r\n")]
-        [TestCase("\r")]
+    [TestCase("\n")]
+    [TestCase("\r\n")]
+    [TestCase("\r")]
 
-        [TestCase("p\n")]
-        [TestCase("p\r")]
-        [TestCase("p\r\n")]
+    [TestCase("p\n")]
+    [TestCase("p\r")]
+    [TestCase("p\r\n")]
 
-        [TestCase("p\np")]
-        [TestCase("p\rp")]
-        [TestCase("p\r\np")]
+    [TestCase("p\np")]
+    [TestCase("p\rp")]
+    [TestCase("p\r\np")]
 
-        [TestCase("p\np\n")]
-        [TestCase("p\rp\n")]
-        [TestCase("p\r\np\n")]
+    [TestCase("p\np\n")]
+    [TestCase("p\rp\n")]
+    [TestCase("p\r\np\n")]
 
-        [TestCase("p\np\r")]
-        [TestCase("p\rp\r")]
-        [TestCase("p\r\np\r")]
+    [TestCase("p\np\r")]
+    [TestCase("p\rp\r")]
+    [TestCase("p\r\np\r")]
 
-        [TestCase("p\np\r\n")]
-        [TestCase("p\rp\r\n")]
-        [TestCase("p\r\np\r\n")]
+    [TestCase("p\np\r\n")]
+    [TestCase("p\rp\r\n")]
+    [TestCase("p\r\np\r\n")]
 
-        [TestCase("\np\n")]
-        [TestCase("\np\r")]
-        [TestCase("\np\r\n")]
+    [TestCase("\np\n")]
+    [TestCase("\np\r")]
+    [TestCase("\np\r\n")]
 
-        [TestCase("\np\np")]
-        [TestCase("\np\rp")]
-        [TestCase("\np\r\np")]
+    [TestCase("\np\np")]
+    [TestCase("\np\rp")]
+    [TestCase("\np\r\np")]
 
-        [TestCase("\np\np\n")]
-        [TestCase("\np\rp\n")]
-        [TestCase("\np\r\np\n")]
+    [TestCase("\np\np\n")]
+    [TestCase("\np\rp\n")]
+    [TestCase("\np\r\np\n")]
 
-        [TestCase("\np\np\r")]
-        [TestCase("\np\rp\r")]
-        [TestCase("\np\r\np\r")]
+    [TestCase("\np\np\r")]
+    [TestCase("\np\rp\r")]
+    [TestCase("\np\r\np\r")]
 
-        [TestCase("\np\np\r\n")]
-        [TestCase("\np\rp\r\n")]
-        [TestCase("\np\r\np\r\n")]
+    [TestCase("\np\np\r\n")]
+    [TestCase("\np\rp\r\n")]
+    [TestCase("\np\r\np\r\n")]
 
-        [TestCase("\rp\n")]
-        [TestCase("\rp\r")]
-        [TestCase("\rp\r\n")]
+    [TestCase("\rp\n")]
+    [TestCase("\rp\r")]
+    [TestCase("\rp\r\n")]
 
-        [TestCase("\rp\np")]
-        [TestCase("\rp\rp")]
-        [TestCase("\rp\r\np")]
+    [TestCase("\rp\np")]
+    [TestCase("\rp\rp")]
+    [TestCase("\rp\r\np")]
 
-        [TestCase("\rp\np\n")]
-        [TestCase("\rp\rp\n")]
-        [TestCase("\rp\r\np\n")]
+    [TestCase("\rp\np\n")]
+    [TestCase("\rp\rp\n")]
+    [TestCase("\rp\r\np\n")]
 
-        [TestCase("\rp\np\r")]
-        [TestCase("\rp\rp\r")]
-        [TestCase("\rp\r\np\r")]
+    [TestCase("\rp\np\r")]
+    [TestCase("\rp\rp\r")]
+    [TestCase("\rp\r\np\r")]
 
-        [TestCase("\rp\np\r\n")]
-        [TestCase("\rp\rp\r\n")]
-        [TestCase("\rp\r\np\r\n")]
+    [TestCase("\rp\np\r\n")]
+    [TestCase("\rp\rp\r\n")]
+    [TestCase("\rp\r\np\r\n")]
 
-        [TestCase("\r\np\n")]
-        [TestCase("\r\np\r")]
-        [TestCase("\r\np\r\n")]
+    [TestCase("\r\np\n")]
+    [TestCase("\r\np\r")]
+    [TestCase("\r\np\r\n")]
 
-        [TestCase("\r\np\np")]
-        [TestCase("\r\np\rp")]
-        [TestCase("\r\np\r\np")]
+    [TestCase("\r\np\np")]
+    [TestCase("\r\np\rp")]
+    [TestCase("\r\np\r\np")]
 
-        [TestCase("\r\np\np\n")]
-        [TestCase("\r\np\rp\n")]
-        [TestCase("\r\np\r\np\n")]
+    [TestCase("\r\np\np\n")]
+    [TestCase("\r\np\rp\n")]
+    [TestCase("\r\np\r\np\n")]
 
-        [TestCase("\r\np\np\r")]
-        [TestCase("\r\np\rp\r")]
-        [TestCase("\r\np\r\np\r")]
+    [TestCase("\r\np\np\r")]
+    [TestCase("\r\np\rp\r")]
+    [TestCase("\r\np\r\np\r")]
 
-        [TestCase("\r\np\np\r\n")]
-        [TestCase("\r\np\rp\r\n")]
-        [TestCase("\r\np\r\np\r\n")]
+    [TestCase("\r\np\np\r\n")]
+    [TestCase("\r\np\rp\r\n")]
+    [TestCase("\r\np\r\np\r\n")]
 
-        [TestCase("p\n")]
-        [TestCase("p\n\n")]
-        [TestCase("p\n\n\n")]
-        [TestCase("p\n\n\n\n")]
-        public void TestNewline(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("p\n")]
+    [TestCase("p\n\n")]
+    [TestCase("p\n\n\n")]
+    [TestCase("p\n\n\n\n")]
+    public void TestNewline(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase(" \n")]
-        [TestCase(" \r")]
-        [TestCase(" \r\n")]
+    [TestCase(" \n")]
+    [TestCase(" \r")]
+    [TestCase(" \r\n")]
 
-        [TestCase(" \np")]
-        [TestCase(" \rp")]
-        [TestCase(" \r\np")]
+    [TestCase(" \np")]
+    [TestCase(" \rp")]
+    [TestCase(" \r\np")]
 
-        [TestCase("  \np")]
-        [TestCase("  \rp")]
-        [TestCase("  \r\np")]
+    [TestCase("  \np")]
+    [TestCase("  \rp")]
+    [TestCase("  \r\np")]
 
-        [TestCase("   \np")]
-        [TestCase("   \rp")]
-        [TestCase("   \r\np")]
+    [TestCase("   \np")]
+    [TestCase("   \rp")]
+    [TestCase("   \r\np")]
 
-        [TestCase(" \n ")]
-        [TestCase(" \r ")]
-        [TestCase(" \r\n ")]
+    [TestCase(" \n ")]
+    [TestCase(" \r ")]
+    [TestCase(" \r\n ")]
 
-        [TestCase(" \np ")]
-        [TestCase(" \rp ")]
-        [TestCase(" \r\np ")]
+    [TestCase(" \np ")]
+    [TestCase(" \rp ")]
+    [TestCase(" \r\np ")]
 
-        [TestCase("  \np ")]
-        [TestCase("  \rp ")]
-        [TestCase("  \r\np ")]
+    [TestCase("  \np ")]
+    [TestCase("  \rp ")]
+    [TestCase("  \r\np ")]
 
-        [TestCase("   \np ")]
-        [TestCase("   \rp ")]
-        [TestCase("   \r\np ")]
-        public void Test_WhitespaceWithNewline(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("   \np ")]
+    [TestCase("   \rp ")]
+    [TestCase("   \r\np ")]
+    public void Test_WhitespaceWithNewline(string value)
+    {
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestQuoteBlock.cs

@@ -1,286 +1,284 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestQuoteBlock
 {
-    [TestFixture]
-    public class TestQuoteBlock
+    [TestCase(">q")]
+    [TestCase(" >q")]
+    [TestCase("  >q")]
+    [TestCase("   >q")]
+    [TestCase("> q")]
+    [TestCase(" > q")]
+    [TestCase("  > q")]
+    [TestCase("   > q")]
+    [TestCase(">  q")]
+    [TestCase(" >  q")]
+    [TestCase("  >  q")]
+    [TestCase("   >  q")]
+
+    [TestCase(">q\n>q")]
+    [TestCase(">q\n >q")]
+    [TestCase(">q\n  >q")]
+    [TestCase(">q\n   >q")]
+    [TestCase(">q\n> q")]
+    [TestCase(">q\n > q")]
+    [TestCase(">q\n  > q")]
+    [TestCase(">q\n   > q")]
+    [TestCase(">q\n>  q")]
+    [TestCase(">q\n >  q")]
+    [TestCase(">q\n  >  q")]
+    [TestCase(">q\n   >  q")]
+
+    [TestCase(" >q\n>q")]
+    [TestCase(" >q\n >q")]
+    [TestCase(" >q\n  >q")]
+    [TestCase(" >q\n   >q")]
+    [TestCase(" >q\n> q")]
+    [TestCase(" >q\n > q")]
+    [TestCase(" >q\n  > q")]
+    [TestCase(" >q\n   > q")]
+    [TestCase(" >q\n>  q")]
+    [TestCase(" >q\n >  q")]
+    [TestCase(" >q\n  >  q")]
+    [TestCase(" >q\n   >  q")]
+
+    [TestCase("  >q\n>q")]
+    [TestCase("  >q\n >q")]
+    [TestCase("  >q\n  >q")]
+    [TestCase("  >q\n   >q")]
+    [TestCase("  >q\n> q")]
+    [TestCase("  >q\n > q")]
+    [TestCase("  >q\n  > q")]
+    [TestCase("  >q\n   > q")]
+    [TestCase("  >q\n>  q")]
+    [TestCase("  >q\n >  q")]
+    [TestCase("  >q\n  >  q")]
+    [TestCase("  >q\n   >  q")]
+
+    [TestCase("> q\n>q")]
+    [TestCase("> q\n >q")]
+    [TestCase("> q\n  >q")]
+    [TestCase("> q\n   >q")]
+    [TestCase("> q\n> q")]
+    [TestCase("> q\n > q")]
+    [TestCase("> q\n  > q")]
+    [TestCase("> q\n   > q")]
+    [TestCase("> q\n>  q")]
+    [TestCase("> q\n >  q")]
+    [TestCase("> q\n  >  q")]
+    [TestCase("> q\n   >  q")]
+
+    [TestCase(" > q\n>q")]
+    [TestCase(" > q\n >q")]
+    [TestCase(" > q\n  >q")]
+    [TestCase(" > q\n   >q")]
+    [TestCase(" > q\n> q")]
+    [TestCase(" > q\n > q")]
+    [TestCase(" > q\n  > q")]
+    [TestCase(" > q\n   > q")]
+    [TestCase(" > q\n>  q")]
+    [TestCase(" > q\n >  q")]
+    [TestCase(" > q\n  >  q")]
+    [TestCase(" > q\n   >  q")]
+
+    [TestCase("  > q\n>q")]
+    [TestCase("  > q\n >q")]
+    [TestCase("  > q\n  >q")]
+    [TestCase("  > q\n   >q")]
+    [TestCase("  > q\n> q")]
+    [TestCase("  > q\n > q")]
+    [TestCase("  > q\n  > q")]
+    [TestCase("  > q\n   > q")]
+    [TestCase("  > q\n>  q")]
+    [TestCase("  > q\n >  q")]
+    [TestCase("  > q\n  >  q")]
+    [TestCase("  > q\n   >  q")]
+
+    [TestCase("   > q\n>q")]
+    [TestCase("   > q\n >q")]
+    [TestCase("   > q\n  >q")]
+    [TestCase("   > q\n   >q")]
+    [TestCase("   > q\n> q")]
+    [TestCase("   > q\n > q")]
+    [TestCase("   > q\n  > q")]
+    [TestCase("   > q\n   > q")]
+    [TestCase("   > q\n>  q")]
+    [TestCase("   > q\n >  q")]
+    [TestCase("   > q\n  >  q")]
+    [TestCase("   > q\n   >  q")]
+
+    [TestCase(">  q\n>q")]
+    [TestCase(">  q\n >q")]
+    [TestCase(">  q\n  >q")]
+    [TestCase(">  q\n   >q")]
+    [TestCase(">  q\n> q")]
+    [TestCase(">  q\n > q")]
+    [TestCase(">  q\n  > q")]
+    [TestCase(">  q\n   > q")]
+    [TestCase(">  q\n>  q")]
+    [TestCase(">  q\n >  q")]
+    [TestCase(">  q\n  >  q")]
+    [TestCase(">  q\n   >  q")]
+
+    [TestCase(" >  q\n>q")]
+    [TestCase(" >  q\n >q")]
+    [TestCase(" >  q\n  >q")]
+    [TestCase(" >  q\n   >q")]
+    [TestCase(" >  q\n> q")]
+    [TestCase(" >  q\n > q")]
+    [TestCase(" >  q\n  > q")]
+    [TestCase(" >  q\n   > q")]
+    [TestCase(" >  q\n>  q")]
+    [TestCase(" >  q\n >  q")]
+    [TestCase(" >  q\n  >  q")]
+    [TestCase(" >  q\n   >  q")]
+
+    [TestCase("  >  q\n>q")]
+    [TestCase("  >  q\n >q")]
+    [TestCase("  >  q\n  >q")]
+    [TestCase("  >  q\n   >q")]
+    [TestCase("  >  q\n> q")]
+    [TestCase("  >  q\n > q")]
+    [TestCase("  >  q\n  > q")]
+    [TestCase("  >  q\n   > q")]
+    [TestCase("  >  q\n>  q")]
+    [TestCase("  >  q\n >  q")]
+    [TestCase("  >  q\n  >  q")]
+    [TestCase("  >  q\n   >  q")]
+
+    [TestCase("   >  q\n>q")]
+    [TestCase("   >  q\n >q")]
+    [TestCase("   >  q\n  >q")]
+    [TestCase("   >  q\n   >q")]
+    [TestCase("   >  q\n> q")]
+    [TestCase("   >  q\n > q")]
+    [TestCase("   >  q\n  > q")]
+    [TestCase("   >  q\n   > q")]
+    [TestCase("   >  q\n>  q")]
+    [TestCase("   >  q\n >  q")]
+    [TestCase("   >  q\n  >  q")]
+    [TestCase("   >  q\n   >  q")]
+
+    [TestCase(">q\n>q\n>q")]
+    [TestCase(">q\n>\n>q")]
+    [TestCase(">q\np\n>q")]
+    [TestCase(">q\n>\n>\n>q")]
+    [TestCase(">q\n>\n>\n>\n>q")]
+    [TestCase(">q\n>\n>q\n>\n>q")]
+    [TestCase("p\n\n> **q**\n>p\n")]
+
+    [TestCase("> q\np\n> q")] // lazy
+    [TestCase("> q\n> q\np")] // lazy
+
+    [TestCase(">>q")]
+    [TestCase(" >  >   q")]
+
+    [TestCase("> **q**\n>p\n")]
+    [TestCase("> **q**")]
+    public void Test(string value)
     {
-        [TestCase(">q")]
-        [TestCase(" >q")]
-        [TestCase("  >q")]
-        [TestCase("   >q")]
-        [TestCase("> q")]
-        [TestCase(" > q")]
-        [TestCase("  > q")]
-        [TestCase("   > q")]
-        [TestCase(">  q")]
-        [TestCase(" >  q")]
-        [TestCase("  >  q")]
-        [TestCase("   >  q")]
+        RoundTrip(value);
+    }
 
-        [TestCase(">q\n>q")]
-        [TestCase(">q\n >q")]
-        [TestCase(">q\n  >q")]
-        [TestCase(">q\n   >q")]
-        [TestCase(">q\n> q")]
-        [TestCase(">q\n > q")]
-        [TestCase(">q\n  > q")]
-        [TestCase(">q\n   > q")]
-        [TestCase(">q\n>  q")]
-        [TestCase(">q\n >  q")]
-        [TestCase(">q\n  >  q")]
-        [TestCase(">q\n   >  q")]
+    [TestCase(">     q")] // 5
+    [TestCase(">      q")] // 6
+    [TestCase(" >     q")] //5
+    [TestCase(" >      q")] //6
+    [TestCase(" > \tq")]
+    [TestCase(">     q\n>     q")] // 5, 5
+    [TestCase(">     q\n>      q")] // 5, 6
+    [TestCase(">      q\n>     q")] // 6, 5
+    [TestCase(">      q\n>      q")] // 6, 6
+    [TestCase(">     q\n\n>     5")] // 5, 5
+    public void TestIndentedCodeBlock(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase(" >q\n>q")]
-        [TestCase(" >q\n >q")]
-        [TestCase(" >q\n  >q")]
-        [TestCase(" >q\n   >q")]
-        [TestCase(" >q\n> q")]
-        [TestCase(" >q\n > q")]
-        [TestCase(" >q\n  > q")]
-        [TestCase(" >q\n   > q")]
-        [TestCase(" >q\n>  q")]
-        [TestCase(" >q\n >  q")]
-        [TestCase(" >q\n  >  q")]
-        [TestCase(" >q\n   >  q")]
+    [TestCase("\n> q")]
+    [TestCase("\n> q\n")]
+    [TestCase("\n> q\n\n")]
+    [TestCase("> q\n\np")]
+    [TestCase("p\n\n> q\n\n# h")]
 
-        [TestCase("  >q\n>q")]
-        [TestCase("  >q\n >q")]
-        [TestCase("  >q\n  >q")]
-        [TestCase("  >q\n   >q")]
-        [TestCase("  >q\n> q")]
-        [TestCase("  >q\n > q")]
-        [TestCase("  >q\n  > q")]
-        [TestCase("  >q\n   > q")]
-        [TestCase("  >q\n>  q")]
-        [TestCase("  >q\n >  q")]
-        [TestCase("  >q\n  >  q")]
-        [TestCase("  >q\n   >  q")]
+    //https://github.com/lunet-io/markdig/issues/480
+    //[TestCase(">\np")]
+    //[TestCase(">**b**\n>\n>p\n>\np\n")]
+    public void TestParagraph(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("> q\n>q")]
-        [TestCase("> q\n >q")]
-        [TestCase("> q\n  >q")]
-        [TestCase("> q\n   >q")]
-        [TestCase("> q\n> q")]
-        [TestCase("> q\n > q")]
-        [TestCase("> q\n  > q")]
-        [TestCase("> q\n   > q")]
-        [TestCase("> q\n>  q")]
-        [TestCase("> q\n >  q")]
-        [TestCase("> q\n  >  q")]
-        [TestCase("> q\n   >  q")]
+    [TestCase("> q\n\n# h\n")]
+    public void TestAtxHeader(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase(" > q\n>q")]
-        [TestCase(" > q\n >q")]
-        [TestCase(" > q\n  >q")]
-        [TestCase(" > q\n   >q")]
-        [TestCase(" > q\n> q")]
-        [TestCase(" > q\n > q")]
-        [TestCase(" > q\n  > q")]
-        [TestCase(" > q\n   > q")]
-        [TestCase(" > q\n>  q")]
-        [TestCase(" > q\n >  q")]
-        [TestCase(" > q\n  >  q")]
-        [TestCase(" > q\n   >  q")]
+    [TestCase(">- i")]
+    [TestCase("> - i")]
+    [TestCase(">- i\n>- i")]
+    [TestCase(">- >p")]
+    [TestCase("> - >p")]
+    [TestCase(">- i1\n>- i2\n")]
+    [TestCase("> **p** p\n>- i1\n>- i2\n")]
+    public void TestUnorderedList(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("  > q\n>q")]
-        [TestCase("  > q\n >q")]
-        [TestCase("  > q\n  >q")]
-        [TestCase("  > q\n   >q")]
-        [TestCase("  > q\n> q")]
-        [TestCase("  > q\n > q")]
-        [TestCase("  > q\n  > q")]
-        [TestCase("  > q\n   > q")]
-        [TestCase("  > q\n>  q")]
-        [TestCase("  > q\n >  q")]
-        [TestCase("  > q\n  >  q")]
-        [TestCase("  > q\n   >  q")]
+    [TestCase("> *q*\n>p\n")]
+    [TestCase("> *q*")]
+    public void TestEmphasis(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("   > q\n>q")]
-        [TestCase("   > q\n >q")]
-        [TestCase("   > q\n  >q")]
-        [TestCase("   > q\n   >q")]
-        [TestCase("   > q\n> q")]
-        [TestCase("   > q\n > q")]
-        [TestCase("   > q\n  > q")]
-        [TestCase("   > q\n   > q")]
-        [TestCase("   > q\n>  q")]
-        [TestCase("   > q\n >  q")]
-        [TestCase("   > q\n  >  q")]
-        [TestCase("   > q\n   >  q")]
+    [TestCase("> **q**\n>p\n")]
+    [TestCase("> **q**")]
+    public void TestStrongEmphasis(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase(">  q\n>q")]
-        [TestCase(">  q\n >q")]
-        [TestCase(">  q\n  >q")]
-        [TestCase(">  q\n   >q")]
-        [TestCase(">  q\n> q")]
-        [TestCase(">  q\n > q")]
-        [TestCase(">  q\n  > q")]
-        [TestCase(">  q\n   > q")]
-        [TestCase(">  q\n>  q")]
-        [TestCase(">  q\n >  q")]
-        [TestCase(">  q\n  >  q")]
-        [TestCase(">  q\n   >  q")]
+    [TestCase(">p\n")]
+    [TestCase(">p\r")]
+    [TestCase(">p\r\n")]
 
-        [TestCase(" >  q\n>q")]
-        [TestCase(" >  q\n >q")]
-        [TestCase(" >  q\n  >q")]
-        [TestCase(" >  q\n   >q")]
-        [TestCase(" >  q\n> q")]
-        [TestCase(" >  q\n > q")]
-        [TestCase(" >  q\n  > q")]
-        [TestCase(" >  q\n   > q")]
-        [TestCase(" >  q\n>  q")]
-        [TestCase(" >  q\n >  q")]
-        [TestCase(" >  q\n  >  q")]
-        [TestCase(" >  q\n   >  q")]
+    [TestCase(">p\n>p")]
+    [TestCase(">p\r>p")]
+    [TestCase(">p\r\n>p")]
 
-        [TestCase("  >  q\n>q")]
-        [TestCase("  >  q\n >q")]
-        [TestCase("  >  q\n  >q")]
-        [TestCase("  >  q\n   >q")]
-        [TestCase("  >  q\n> q")]
-        [TestCase("  >  q\n > q")]
-        [TestCase("  >  q\n  > q")]
-        [TestCase("  >  q\n   > q")]
-        [TestCase("  >  q\n>  q")]
-        [TestCase("  >  q\n >  q")]
-        [TestCase("  >  q\n  >  q")]
-        [TestCase("  >  q\n   >  q")]
+    [TestCase(">p\n>p\n")]
+    [TestCase(">p\r>p\n")]
+    [TestCase(">p\r\n>p\n")]
 
-        [TestCase("   >  q\n>q")]
-        [TestCase("   >  q\n >q")]
-        [TestCase("   >  q\n  >q")]
-        [TestCase("   >  q\n   >q")]
-        [TestCase("   >  q\n> q")]
-        [TestCase("   >  q\n > q")]
-        [TestCase("   >  q\n  > q")]
-        [TestCase("   >  q\n   > q")]
-        [TestCase("   >  q\n>  q")]
-        [TestCase("   >  q\n >  q")]
-        [TestCase("   >  q\n  >  q")]
-        [TestCase("   >  q\n   >  q")]
+    [TestCase(">p\n>p\r")]
+    [TestCase(">p\r>p\r")]
+    [TestCase(">p\r\n>p\r")]
 
-        [TestCase(">q\n>q\n>q")]
-        [TestCase(">q\n>\n>q")]
-        [TestCase(">q\np\n>q")]
-        [TestCase(">q\n>\n>\n>q")]
-        [TestCase(">q\n>\n>\n>\n>q")]
-        [TestCase(">q\n>\n>q\n>\n>q")]
-        [TestCase("p\n\n> **q**\n>p\n")]
+    [TestCase(">p\n>p\r\n")]
+    [TestCase(">p\r>p\r\n")]
+    [TestCase(">p\r\n>p\r\n")]
+    public void TestNewline(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("> q\np\n> q")] // lazy
-        [TestCase("> q\n> q\np")] // lazy
-
-        [TestCase(">>q")]
-        [TestCase(" >  >   q")]
-
-        [TestCase("> **q**\n>p\n")]
-        [TestCase("> **q**")]
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase(">     q")] // 5
-        [TestCase(">      q")] // 6
-        [TestCase(" >     q")] //5
-        [TestCase(" >      q")] //6
-        [TestCase(" > \tq")]
-        [TestCase(">     q\n>     q")] // 5, 5
-        [TestCase(">     q\n>      q")] // 5, 6
-        [TestCase(">      q\n>     q")] // 6, 5
-        [TestCase(">      q\n>      q")] // 6, 6
-        [TestCase(">     q\n\n>     5")] // 5, 5
-        public void TestIndentedCodeBlock(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("\n> q")]
-        [TestCase("\n> q\n")]
-        [TestCase("\n> q\n\n")]
-        [TestCase("> q\n\np")]
-        [TestCase("p\n\n> q\n\n# h")]
-
-        //https://github.com/lunet-io/markdig/issues/480
-        //[TestCase(">\np")]
-        //[TestCase(">**b**\n>\n>p\n>\np\n")]
-        public void TestParagraph(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("> q\n\n# h\n")]
-        public void TestAtxHeader(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase(">- i")]
-        [TestCase("> - i")]
-        [TestCase(">- i\n>- i")]
-        [TestCase(">- >p")]
-        [TestCase("> - >p")]
-        [TestCase(">- i1\n>- i2\n")]
-        [TestCase("> **p** p\n>- i1\n>- i2\n")]
-        public void TestUnorderedList(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("> *q*\n>p\n")]
-        [TestCase("> *q*")]
-        public void TestEmphasis(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase("> **q**\n>p\n")]
-        [TestCase("> **q**")]
-        public void TestStrongEmphasis(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase(">p\n")]
-        [TestCase(">p\r")]
-        [TestCase(">p\r\n")]
-
-        [TestCase(">p\n>p")]
-        [TestCase(">p\r>p")]
-        [TestCase(">p\r\n>p")]
-
-        [TestCase(">p\n>p\n")]
-        [TestCase(">p\r>p\n")]
-        [TestCase(">p\r\n>p\n")]
-
-        [TestCase(">p\n>p\r")]
-        [TestCase(">p\r>p\r")]
-        [TestCase(">p\r\n>p\r")]
-
-        [TestCase(">p\n>p\r\n")]
-        [TestCase(">p\r>p\r\n")]
-        [TestCase(">p\r\n>p\r\n")]
-        public void TestNewline(string value)
-        {
-            RoundTrip(value);
-        }
-
-        [TestCase(">\n>q")]
-        [TestCase(">\n>\n>q")]
-        [TestCase(">q\n>\n>q")]
-        [TestCase(">q\n>\n>\n>q")]
-        [TestCase(">q\n> \n>q")]
-        [TestCase(">q\n>  \n>q")]
-        [TestCase(">q\n>   \n>q")]
-        [TestCase(">q\n>\t\n>q")]
-        [TestCase(">q\n>\v\n>q")]
-        [TestCase(">q\n>\f\n>q")]
-        public void TestEmptyLines(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase(">\n>q")]
+    [TestCase(">\n>\n>q")]
+    [TestCase(">q\n>\n>q")]
+    [TestCase(">q\n>\n>\n>q")]
+    [TestCase(">q\n> \n>q")]
+    [TestCase(">q\n>  \n>q")]
+    [TestCase(">q\n>   \n>q")]
+    [TestCase(">q\n>\t\n>q")]
+    [TestCase(">q\n>\v\n>q")]
+    [TestCase(">q\n>\f\n>q")]
+    public void TestEmptyLines(string value)
+    {
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestSetextHeading.cs

@@ -1,53 +1,51 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestSetextHeading
 {
-    [TestFixture]
-    public class TestSetextHeading
+    [TestCase("h1\n===")] //3
+    [TestCase("h1\n ===")] //3
+    [TestCase("h1\n  ===")] //3
+    [TestCase("h1\n   ===")] //3
+    [TestCase("h1\n=== ")] //3
+    [TestCase("h1 \n===")] //3
+    [TestCase("h1\\\n===")] //3
+    [TestCase("h1\n === ")] //3
+    [TestCase("h1\nh1 l2\n===")] //3
+    [TestCase("h1\n====")] // 4
+    [TestCase("h1\n ====")] // 4
+    [TestCase("h1\n==== ")] // 4
+    [TestCase("h1\n ==== ")] // 4
+    [TestCase("h1\n===\nh1\n===")] //3
+    [TestCase("\\>h1\n===")] //3
+    public void Test(string value)
     {
-        [TestCase("h1\n===")] //3
-        [TestCase("h1\n ===")] //3
-        [TestCase("h1\n  ===")] //3
-        [TestCase("h1\n   ===")] //3
-        [TestCase("h1\n=== ")] //3
-        [TestCase("h1 \n===")] //3
-        [TestCase("h1\\\n===")] //3
-        [TestCase("h1\n === ")] //3
-        [TestCase("h1\nh1 l2\n===")] //3
-        [TestCase("h1\n====")] // 4
-        [TestCase("h1\n ====")] // 4
-        [TestCase("h1\n==== ")] // 4
-        [TestCase("h1\n ==== ")] // 4
-        [TestCase("h1\n===\nh1\n===")] //3
-        [TestCase("\\>h1\n===")] //3
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
+        RoundTrip(value);
+    }
 
-        [TestCase("h1\r===")]
-        [TestCase("h1\n===")]
-        [TestCase("h1\r\n===")]
+    [TestCase("h1\r===")]
+    [TestCase("h1\n===")]
+    [TestCase("h1\r\n===")]
 
-        [TestCase("h1\r===\r")]
-        [TestCase("h1\n===\r")]
-        [TestCase("h1\r\n===\r")]
+    [TestCase("h1\r===\r")]
+    [TestCase("h1\n===\r")]
+    [TestCase("h1\r\n===\r")]
 
-        [TestCase("h1\r===\n")]
-        [TestCase("h1\n===\n")]
-        [TestCase("h1\r\n===\n")]
+    [TestCase("h1\r===\n")]
+    [TestCase("h1\n===\n")]
+    [TestCase("h1\r\n===\n")]
 
-        [TestCase("h1\r===\r\n")]
-        [TestCase("h1\n===\r\n")]
-        [TestCase("h1\r\n===\r\n")]
+    [TestCase("h1\r===\r\n")]
+    [TestCase("h1\n===\r\n")]
+    [TestCase("h1\r\n===\r\n")]
 
-        [TestCase("h1\n===\n\n\nh2---\n\n")]
-        [TestCase("h1\r===\r\r\rh2---\r\r")]
-        [TestCase("h1\r\n===\r\n\r\n\r\nh2---\r\n\r\n")]
-        public void TestNewline(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("h1\n===\n\n\nh2---\n\n")]
+    [TestCase("h1\r===\r\r\rh2---\r\r")]
+    [TestCase("h1\r\n===\r\n\r\n\r\nh2---\r\n\r\n")]
+    public void TestNewline(string value)
+    {
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestThematicBreak.cs

@@ -1,53 +1,51 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestThematicBreak
 {
-    [TestFixture]
-    public class TestThematicBreak
+    [TestCase("---")]
+    [TestCase(" ---")]
+    [TestCase("  ---")]
+    [TestCase("   ---")]
+    [TestCase("--- ")]
+    [TestCase(" --- ")]
+    [TestCase("  --- ")]
+    [TestCase("   --- ")]
+    [TestCase("- - -")]
+    [TestCase(" - - -")]
+    [TestCase(" - - - ")]
+    [TestCase("-- -")]
+    [TestCase("---\n")]
+    [TestCase("---\n\n")]
+    [TestCase("---\np")]
+    [TestCase("---\n\np")]
+    [TestCase("---\n# h")]
+    [TestCase("p\n\n---")]
+    // Note: "p\n---" is parsed as setext heading
+    public void Test(string value)
     {
-        [TestCase("---")]
-        [TestCase(" ---")]
-        [TestCase("  ---")]
-        [TestCase("   ---")]
-        [TestCase("--- ")]
-        [TestCase(" --- ")]
-        [TestCase("  --- ")]
-        [TestCase("   --- ")]
-        [TestCase("- - -")]
-        [TestCase(" - - -")]
-        [TestCase(" - - - ")]
-        [TestCase("-- -")]
-        [TestCase("---\n")]
-        [TestCase("---\n\n")]
-        [TestCase("---\np")]
-        [TestCase("---\n\np")]
-        [TestCase("---\n# h")]
-        [TestCase("p\n\n---")]
-        // Note: "p\n---" is parsed as setext heading
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
+        RoundTrip(value);
+    }
 
-        [TestCase("\n---")]
-        [TestCase("\r---")]
-        [TestCase("\r\n---")]
+    [TestCase("\n---")]
+    [TestCase("\r---")]
+    [TestCase("\r\n---")]
 
-        [TestCase("\n---\n")]
-        [TestCase("\r---\n")]
-        [TestCase("\r\n---\n")]
+    [TestCase("\n---\n")]
+    [TestCase("\r---\n")]
+    [TestCase("\r\n---\n")]
 
-        [TestCase("\n---\r")]
-        [TestCase("\r---\r")]
-        [TestCase("\r\n---\r")]
+    [TestCase("\n---\r")]
+    [TestCase("\r---\r")]
+    [TestCase("\r\n---\r")]
 
-        [TestCase("\n---\r\n")]
-        [TestCase("\r---\r\n")]
-        [TestCase("\r\n---\r\n")]
-        public void TestNewline(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("\n---\r\n")]
+    [TestCase("\r---\r\n")]
+    [TestCase("\r\n---\r\n")]
+    public void TestNewline(string value)
+    {
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestUnorderedList.cs

@@ -1,183 +1,181 @@
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestUnorderedList
 {
-    [TestFixture]
-    public class TestUnorderedList
+    // i = item
+    [TestCase("- i1")]
+    [TestCase("- i1 ")]
+    [TestCase("- i1\n")]
+    [TestCase("- i1\n\n")]
+    [TestCase("- i1\n- i2")]
+    [TestCase("- i1\n    - i2")]
+    [TestCase("- i1\n    - i1.1\n    - i1.2")]
+    [TestCase("- i1 \n- i2 \n")]
+    [TestCase("- i1  \n- i2  \n")]
+    [TestCase(" - i1")]
+    [TestCase("  - i1")]
+    [TestCase("   - i1")]
+    [TestCase("- i1\n\n- i1")]
+    [TestCase("- i1\n\n\n- i1")]
+    [TestCase("- i1\n    - i1.1\n        - i1.1.1\n")]
+
+    [TestCase("-\ti1")]
+    [TestCase("-\ti1\n-\ti2")]
+    [TestCase("-\ti1\n-  i2\n-\ti3")]
+    public void Test(string value)
     {
-        // i = item
-        [TestCase("- i1")]
-        [TestCase("- i1 ")]
-        [TestCase("- i1\n")]
-        [TestCase("- i1\n\n")]
-        [TestCase("- i1\n- i2")]
-        [TestCase("- i1\n    - i2")]
-        [TestCase("- i1\n    - i1.1\n    - i1.2")]
-        [TestCase("- i1 \n- i2 \n")]
-        [TestCase("- i1  \n- i2  \n")]
-        [TestCase(" - i1")]
-        [TestCase("  - i1")]
-        [TestCase("   - i1")]
-        [TestCase("- i1\n\n- i1")]
-        [TestCase("- i1\n\n\n- i1")]
-        [TestCase("- i1\n    - i1.1\n        - i1.1.1\n")]
+        RoundTrip(value);
+    }
 
-        [TestCase("-\ti1")]
-        [TestCase("-\ti1\n-\ti2")]
-        [TestCase("-\ti1\n-  i2\n-\ti3")]
-        public void Test(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("- > q")]
+    [TestCase(" - > q")]
+    [TestCase("  - > q")]
+    [TestCase("   - > q")]
+    [TestCase("-  > q")]
+    [TestCase(" -  > q")]
+    [TestCase("  -  > q")]
+    [TestCase("   -  > q")]
+    [TestCase("-   > q")]
+    [TestCase(" -   > q")]
+    [TestCase("  -   > q")]
+    [TestCase("   -   > q")]
+    [TestCase("-    > q")]
+    [TestCase(" -    > q")]
+    [TestCase("  -    > q")]
+    [TestCase("   -    > q")]
+    [TestCase("   -    > q1\n   -    > q2")]
+    public void TestBlockQuote(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("- > q")]
-        [TestCase(" - > q")]
-        [TestCase("  - > q")]
-        [TestCase("   - > q")]
-        [TestCase("-  > q")]
-        [TestCase(" -  > q")]
-        [TestCase("  -  > q")]
-        [TestCase("   -  > q")]
-        [TestCase("-   > q")]
-        [TestCase(" -   > q")]
-        [TestCase("  -   > q")]
-        [TestCase("   -   > q")]
-        [TestCase("-    > q")]
-        [TestCase(" -    > q")]
-        [TestCase("  -    > q")]
-        [TestCase("   -    > q")]
-        [TestCase("   -    > q1\n   -    > q2")]
-        public void TestBlockQuote(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("-     i1\n\np\n")] // TODO: listblock should render newline, apparently last paragraph of last listitem dont have newline
+    [TestCase("-     i1\n\n\np\n")]
+    [TestCase("- i1\n\np")]
+    [TestCase("- i1\n\np\n")]
+    public void TestParagraph(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("-     i1\n\np\n")] // TODO: listblock should render newline, apparently last paragraph of last listitem dont have newline
-        [TestCase("-     i1\n\n\np\n")]
-        [TestCase("- i1\n\np")]
-        [TestCase("- i1\n\np\n")]
-        public void TestParagraph(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("- i1\n\n---\n")]
+    [TestCase("- i1\n\n\n---\n")]
+    public void TestThematicBreak(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("- i1\n\n---\n")]
-        [TestCase("- i1\n\n\n---\n")]
-        public void TestThematicBreak(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("-     c")] // 5
+    [TestCase("-     c\n      c")] // 5, 6
+    [TestCase(" -     c\n      c")] // 5, 6
+    [TestCase(" -     c\n       c")] // 5, 7
+    [TestCase("-      c\n      c")] // 6, 6
+    [TestCase(" -      c\n      c")] // 6, 6
+    [TestCase(" -      c\n       c")] // 6, 7
+    public void TestIndentedCodeBlock(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("-     c")] // 5
-        [TestCase("-     c\n      c")] // 5, 6
-        [TestCase(" -     c\n      c")] // 5, 6
-        [TestCase(" -     c\n       c")] // 5, 7
-        [TestCase("-      c\n      c")] // 6, 6
-        [TestCase(" -      c\n      c")] // 6, 6
-        [TestCase(" -      c\n       c")] // 6, 7
-        public void TestIndentedCodeBlock(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("- ```a```")]
+    [TestCase("- ```\n  a\n```")]
+    [TestCase("- i1\n    - i1.1\n    ```\n    c\n    ```")]
+    [TestCase("- i1\n    - i1.1\n    ```\nc\n```")]
+    [TestCase("- i1\n    - i1.1\n    ```\nc\n```\n")]
+    public void TestFencedCodeBlock(string value)
+    {
+        RoundTrip(value);
+    }
 
-        [TestCase("- ```a```")]
-        [TestCase("- ```\n  a\n```")]
-        [TestCase("- i1\n    - i1.1\n    ```\n    c\n    ```")]
-        [TestCase("- i1\n    - i1.1\n    ```\nc\n```")]
-        [TestCase("- i1\n    - i1.1\n    ```\nc\n```\n")]
-        public void TestFencedCodeBlock(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("\n- i")]
+    [TestCase("\r- i")]
+    [TestCase("\r\n- i")]
 
-        [TestCase("\n- i")]
-        [TestCase("\r- i")]
-        [TestCase("\r\n- i")]
+    [TestCase("\n- i\n")]
+    [TestCase("\r- i\n")]
+    [TestCase("\r\n- i\n")]
 
-        [TestCase("\n- i\n")]
-        [TestCase("\r- i\n")]
-        [TestCase("\r\n- i\n")]
+    [TestCase("\n- i\r")]
+    [TestCase("\r- i\r")]
+    [TestCase("\r\n- i\r")]
 
-        [TestCase("\n- i\r")]
-        [TestCase("\r- i\r")]
-        [TestCase("\r\n- i\r")]
+    [TestCase("\n- i\r\n")]
+    [TestCase("\r- i\r\n")]
+    [TestCase("\r\n- i\r\n")]
 
-        [TestCase("\n- i\r\n")]
-        [TestCase("\r- i\r\n")]
-        [TestCase("\r\n- i\r\n")]
+    [TestCase("- i\n- j")]
+    [TestCase("- i\r- j")]
+    [TestCase("- i\r\n- j")]
 
-        [TestCase("- i\n- j")]
-        [TestCase("- i\r- j")]
-        [TestCase("- i\r\n- j")]
+    [TestCase("\n- i\n- j")]
+    [TestCase("\n- i\r- j")]
+    [TestCase("\n- i\r\n- j")]
 
-        [TestCase("\n- i\n- j")]
-        [TestCase("\n- i\r- j")]
-        [TestCase("\n- i\r\n- j")]
+    [TestCase("\r- i\n- j")]
+    [TestCase("\r- i\r- j")]
+    [TestCase("\r- i\r\n- j")]
 
-        [TestCase("\r- i\n- j")]
-        [TestCase("\r- i\r- j")]
-        [TestCase("\r- i\r\n- j")]
+    [TestCase("\r\n- i\n- j")]
+    [TestCase("\r\n- i\r- j")]
+    [TestCase("\r\n- i\r\n- j")]
 
-        [TestCase("\r\n- i\n- j")]
-        [TestCase("\r\n- i\r- j")]
-        [TestCase("\r\n- i\r\n- j")]
+    [TestCase("- i\n- j\n")]
+    [TestCase("- i\r- j\n")]
+    [TestCase("- i\r\n- j\n")]
 
-        [TestCase("- i\n- j\n")]
-        [TestCase("- i\r- j\n")]
-        [TestCase("- i\r\n- j\n")]
+    [TestCase("\n- i\n- j\n")]
+    [TestCase("\n- i\r- j\n")]
+    [TestCase("\n- i\r\n- j\n")]
 
-        [TestCase("\n- i\n- j\n")]
-        [TestCase("\n- i\r- j\n")]
-        [TestCase("\n- i\r\n- j\n")]
+    [TestCase("\r- i\n- j\n")]
+    [TestCase("\r- i\r- j\n")]
+    [TestCase("\r- i\r\n- j\n")]
 
-        [TestCase("\r- i\n- j\n")]
-        [TestCase("\r- i\r- j\n")]
-        [TestCase("\r- i\r\n- j\n")]
+    [TestCase("\r\n- i\n- j\n")]
+    [TestCase("\r\n- i\r- j\n")]
+    [TestCase("\r\n- i\r\n- j\n")]
 
-        [TestCase("\r\n- i\n- j\n")]
-        [TestCase("\r\n- i\r- j\n")]
-        [TestCase("\r\n- i\r\n- j\n")]
+    [TestCase("- i\n- j\r")]
+    [TestCase("- i\r- j\r")]
+    [TestCase("- i\r\n- j\r")]
 
-        [TestCase("- i\n- j\r")]
-        [TestCase("- i\r- j\r")]
-        [TestCase("- i\r\n- j\r")]
+    [TestCase("\n- i\n- j\r")]
+    [TestCase("\n- i\r- j\r")]
+    [TestCase("\n- i\r\n- j\r")]
 
-        [TestCase("\n- i\n- j\r")]
-        [TestCase("\n- i\r- j\r")]
-        [TestCase("\n- i\r\n- j\r")]
+    [TestCase("\r- i\n- j\r")]
+    [TestCase("\r- i\r- j\r")]
+    [TestCase("\r- i\r\n- j\r")]
 
-        [TestCase("\r- i\n- j\r")]
-        [TestCase("\r- i\r- j\r")]
-        [TestCase("\r- i\r\n- j\r")]
+    [TestCase("\r\n- i\n- j\r")]
+    [TestCase("\r\n- i\r- j\r")]
+    [TestCase("\r\n- i\r\n- j\r")]
 
-        [TestCase("\r\n- i\n- j\r")]
-        [TestCase("\r\n- i\r- j\r")]
-        [TestCase("\r\n- i\r\n- j\r")]
+    [TestCase("- i\n- j\r\n")]
+    [TestCase("- i\r- j\r\n")]
+    [TestCase("- i\r\n- j\r\n")]
 
-        [TestCase("- i\n- j\r\n")]
-        [TestCase("- i\r- j\r\n")]
-        [TestCase("- i\r\n- j\r\n")]
+    [TestCase("\n- i\n- j\r\n")]
+    [TestCase("\n- i\r- j\r\n")]
+    [TestCase("\n- i\r\n- j\r\n")]
 
-        [TestCase("\n- i\n- j\r\n")]
-        [TestCase("\n- i\r- j\r\n")]
-        [TestCase("\n- i\r\n- j\r\n")]
+    [TestCase("\r- i\n- j\r\n")]
+    [TestCase("\r- i\r- j\r\n")]
+    [TestCase("\r- i\r\n- j\r\n")]
 
-        [TestCase("\r- i\n- j\r\n")]
-        [TestCase("\r- i\r- j\r\n")]
-        [TestCase("\r- i\r\n- j\r\n")]
+    [TestCase("\r\n- i\n- j\r\n")]
+    [TestCase("\r\n- i\r- j\r\n")]
+    [TestCase("\r\n- i\r\n- j\r\n")]
 
-        [TestCase("\r\n- i\n- j\r\n")]
-        [TestCase("\r\n- i\r- j\r\n")]
-        [TestCase("\r\n- i\r\n- j\r\n")]
-
-        [TestCase("- i\n")]
-        [TestCase("- i\n\n")]
-        [TestCase("- i\n\n\n")]
-        [TestCase("- i\n\n\n\n")]
-        public void TestNewline(string value)
-        {
-            RoundTrip(value);
-        }
+    [TestCase("- i\n")]
+    [TestCase("- i\n\n")]
+    [TestCase("- i\n\n\n")]
+    [TestCase("- i\n\n\n\n")]
+    public void TestNewline(string value)
+    {
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/RoundtripSpecs/TestYamlFrontMatterBlock.cs

@@ -1,25 +1,15 @@
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using Markdig.Renderers.Roundtrip;
-using Markdig.Syntax;
-using NUnit.Framework;
 using static Markdig.Tests.TestRoundtrip;
 
-namespace Markdig.Tests.RoundtripSpecs
+namespace Markdig.Tests.RoundtripSpecs;
+
+[TestFixture]
+public class TestYamlFrontMatterBlock
 {
-    [TestFixture]
-    public class TestYamlFrontMatterBlock
+    [TestCase("---\nkey1: value1\nkey2: value2\n---\n\nContent\n")]
+    [TestCase("No front matter")]
+    [TestCase("Looks like front matter but actually is not\n---\nkey1: value1\nkey2: value2\n---")]
+    public void FrontMatterBlockIsPreserved(string value)
     {
-        [TestCase("---\nkey1: value1\nkey2: value2\n---\n\nContent\n")]
-        [TestCase("No front matter")]
-        [TestCase("Looks like front matter but actually is not\n---\nkey1: value1\nkey2: value2\n---")]
-        public void FrontMatterBlockIsPreserved(string value)
-        {
-            RoundTrip(value);
-        }
+        RoundTrip(value);
     }
 }

src/Markdig.Tests/Specs/AlertBlockSpecs.generated.cs

@@ -0,0 +1,179 @@
+
+// --------------------------------
+//           Alert Blocks
+// --------------------------------
+
+using System;
+using NUnit.Framework;
+
+namespace Markdig.Tests.Specs.AlertBlocks
+{
+    [TestFixture]
+    public class TestExtensionsAlertBlocks
+    {
+        // # Extensions
+        // 
+        // This section describes the different extensions supported:
+        // 
+        // ## Alert Blocks
+        // 
+        // This is supporting the [GitHub Alert blocks](https://github.com/orgs/community/discussions/16925)
+        [Test]
+        public void ExtensionsAlertBlocks_Example001()
+        {
+            // Example 1
+            // Section: Extensions / Alert Blocks
+            //
+            // The following Markdown:
+            //     > [!NOTE]  
+            //     > Highlights information that users should take into account, even when skimming.
+            //     
+            //     > [!TIP]
+            //     > Optional information to help a user be more successful.
+            //     
+            //     > [!IMPORTANT]  
+            //     > Crucial information necessary for users to succeed.
+            //     
+            //     > [!WARNING]  
+            //     > Critical content demanding immediate user attention due to potential risks.
+            //     
+            //     > [!CAUTION]
+            //     > Negative potential consequences of an action.
+            //
+            // Should be rendered as:
+            //     <div class="markdown-alert markdown-alert-note">
+            //     <p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p>
+            //     <p>Highlights information that users should take into account, even when skimming.</p>
+            //     </div>
+            //     <div class="markdown-alert markdown-alert-tip">
+            //     <p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M8 1.5c-2.363 0-4 1.69-4 3.75 0 .984.424 1.625.984 2.304l.214.253c.223.264.47.556.673.848.284.411.537.896.621 1.49a.75.75 0 0 1-1.484.211c-.04-.282-.163-.547-.37-.847a8.456 8.456 0 0 0-.542-.68c-.084-.1-.173-.205-.268-.32C3.201 7.75 2.5 6.766 2.5 5.25 2.5 2.31 4.863 0 8 0s5.5 2.31 5.5 5.25c0 1.516-.701 2.5-1.328 3.259-.095.115-.184.22-.268.319-.207.245-.383.453-.541.681-.208.3-.33.565-.37.847a.751.751 0 0 1-1.485-.212c.084-.593.337-1.078.621-1.489.203-.292.45-.584.673-.848.075-.088.147-.173.213-.253.561-.679.985-1.32.985-2.304 0-2.06-1.637-3.75-4-3.75ZM5.75 12h4.5a.75.75 0 0 1 0 1.5h-4.5a.75.75 0 0 1 0-1.5ZM6 15.25a.75.75 0 0 1 .75-.75h2.5a.75.75 0 0 1 0 1.5h-2.5a.75.75 0 0 1-.75-.75Z"></path></svg>Tip</p>
+            //     <p>Optional information to help a user be more successful.</p>
+            //     </div>
+            //     <div class="markdown-alert markdown-alert-important">
+            //     <p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>Important</p>
+            //     <p>Crucial information necessary for users to succeed.</p>
+            //     </div>
+            //     <div class="markdown-alert markdown-alert-warning">
+            //     <p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>Warning</p>
+            //     <p>Critical content demanding immediate user attention due to potential risks.</p>
+            //     </div>
+            //     <div class="markdown-alert markdown-alert-caution">
+            //     <p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Caution</p>
+            //     <p>Negative potential consequences of an action.</p>
+            //     </div>
+
+            TestParser.TestSpec("> [!NOTE]  \n> Highlights information that users should take into account, even when skimming.\n\n> [!TIP]\n> Optional information to help a user be more successful.\n\n> [!IMPORTANT]  \n> Crucial information necessary for users to succeed.\n\n> [!WARNING]  \n> Critical content demanding immediate user attention due to potential risks.\n\n> [!CAUTION]\n> Negative potential consequences of an action.", "<div class=\"markdown-alert markdown-alert-note\">\n<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"></path></svg>Note</p>\n<p>Highlights information that users should take into account, even when skimming.</p>\n</div>\n<div class=\"markdown-alert markdown-alert-tip\">\n<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M8 1.5c-2.363 0-4 1.69-4 3.75 0 .984.424 1.625.984 2.304l.214.253c.223.264.47.556.673.848.284.411.537.896.621 1.49a.75.75 0 0 1-1.484.211c-.04-.282-.163-.547-.37-.847a8.456 8.456 0 0 0-.542-.68c-.084-.1-.173-.205-.268-.32C3.201 7.75 2.5 6.766 2.5 5.25 2.5 2.31 4.863 0 8 0s5.5 2.31 5.5 5.25c0 1.516-.701 2.5-1.328 3.259-.095.115-.184.22-.268.319-.207.245-.383.453-.541.681-.208.3-.33.565-.37.847a.751.751 0 0 1-1.485-.212c.084-.593.337-1.078.621-1.489.203-.292.45-.584.673-.848.075-.088.147-.173.213-.253.561-.679.985-1.32.985-2.304 0-2.06-1.637-3.75-4-3.75ZM5.75 12h4.5a.75.75 0 0 1 0 1.5h-4.5a.75.75 0 0 1 0-1.5ZM6 15.25a.75.75 0 0 1 .75-.75h2.5a.75.75 0 0 1 0 1.5h-2.5a.75.75 0 0 1-.75-.75Z\"></path></svg>Tip</p>\n<p>Optional information to help a user be more successful.</p>\n</div>\n<div class=\"markdown-alert markdown-alert-important\">\n<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"></path></svg>Important</p>\n<p>Crucial information necessary for users to succeed.</p>\n</div>\n<div class=\"markdown-alert markdown-alert-warning\">\n<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"></path></svg>Warning</p>\n<p>Critical content demanding immediate user attention due to potential risks.</p>\n</div>\n<div class=\"markdown-alert markdown-alert-caution\">\n<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"></path></svg>Caution</p>\n<p>Negative potential consequences of an action.</p>\n</div>", "advanced", context: "Example 1\nSection Extensions / Alert Blocks\n");
+        }
+
+        // Example with code blocks and mix formatting:
+        [Test]
+        public void ExtensionsAlertBlocks_Example002()
+        {
+            // Example 2
+            // Section: Extensions / Alert Blocks
+            //
+            // The following Markdown:
+            //     > [!NOTE]
+            //     > Highlights information that users should take into account, even when skimming.
+            //     > Testing rendering for multiple lines
+            //     > ```csharp
+            //     > var test = "I can also add code to panels
+            //     > ```
+            //     > `Inline code testing`
+            //
+            // Should be rendered as:
+            //     <div class="markdown-alert markdown-alert-note">
+            //     <p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p>
+            //     <p>Highlights information that users should take into account, even when skimming.
+            //     Testing rendering for multiple lines</p>
+            //     <pre><code class="language-csharp">var test = &quot;I can also add code to panels
+            //     </code></pre>
+            //     <p><code>Inline code testing</code></p>
+            //     </div>
+
+            TestParser.TestSpec("> [!NOTE]\n> Highlights information that users should take into account, even when skimming.\n> Testing rendering for multiple lines\n> ```csharp\n> var test = \"I can also add code to panels\n> ```\n> `Inline code testing`", "<div class=\"markdown-alert markdown-alert-note\">\n<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"></path></svg>Note</p>\n<p>Highlights information that users should take into account, even when skimming.\nTesting rendering for multiple lines</p>\n<pre><code class=\"language-csharp\">var test = &quot;I can also add code to panels\n</code></pre>\n<p><code>Inline code testing</code></p>\n</div>", "advanced", context: "Example 2\nSection Extensions / Alert Blocks\n");
+        }
+
+        // Multiline:
+        [Test]
+        public void ExtensionsAlertBlocks_Example003()
+        {
+            // Example 3
+            // Section: Extensions / Alert Blocks
+            //
+            // The following Markdown:
+            //     > [!NOTE]
+            //     > Highlights information that users should take into account, even when skimming.
+            //     > 
+            //     > Testing rendering for multiple lines
+            //     > 
+            //     > `Inline code testing`
+            //     > 
+            //     > Other line
+            //     > 
+            //     > > Nested quote
+            //     > >
+            //     > > Final nested quote line
+            //     > 
+            //     > Final line of alert
+            //
+            // Should be rendered as:
+            //     <div class="markdown-alert markdown-alert-note">
+            //     <p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p>
+            //     <p>Highlights information that users should take into account, even when skimming.</p>
+            //     <p>Testing rendering for multiple lines</p>
+            //     <p><code>Inline code testing</code></p>
+            //     <p>Other line</p>
+            //     <blockquote>
+            //     <p>Nested quote</p>
+            //     <p>Final nested quote line</p>
+            //     </blockquote>
+            //     <p>Final line of alert</p>
+            //     </div>
+
+            TestParser.TestSpec("> [!NOTE]\n> Highlights information that users should take into account, even when skimming.\n> \n> Testing rendering for multiple lines\n> \n> `Inline code testing`\n> \n> Other line\n> \n> > Nested quote\n> >\n> > Final nested quote line\n> \n> Final line of alert", "<div class=\"markdown-alert markdown-alert-note\">\n<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"></path></svg>Note</p>\n<p>Highlights information that users should take into account, even when skimming.</p>\n<p>Testing rendering for multiple lines</p>\n<p><code>Inline code testing</code></p>\n<p>Other line</p>\n<blockquote>\n<p>Nested quote</p>\n<p>Final nested quote line</p>\n</blockquote>\n<p>Final line of alert</p>\n</div>", "advanced", context: "Example 3\nSection Extensions / Alert Blocks\n");
+        }
+
+        // An alert inline (e.g `[!NOTE]`) must come first in a quote block, and must be followed by optional spaces with a new line. If no new lines are found, it will not be considered as an alert block.
+        // 
+        // Followed by space and new line:
+        [Test]
+        public void ExtensionsAlertBlocks_Example004()
+        {
+            // Example 4
+            // Section: Extensions / Alert Blocks
+            //
+            // The following Markdown:
+            //     > [!NOTE] This is invalid because no new line
+            //     > Highlights information that users should take into account, even when skimming.
+            //
+            // Should be rendered as:
+            //     <blockquote>
+            //     <p>[!NOTE] This is invalid because no new line
+            //     Highlights information that users should take into account, even when skimming.</p>
+            //     </blockquote>
+
+            TestParser.TestSpec("> [!NOTE] This is invalid because no new line\n> Highlights information that users should take into account, even when skimming.", "<blockquote>\n<p>[!NOTE] This is invalid because no new line\nHighlights information that users should take into account, even when skimming.</p>\n</blockquote>", "advanced", context: "Example 4\nSection Extensions / Alert Blocks\n");
+        }
+
+        // Must come first in a quote block:
+        [Test]
+        public void ExtensionsAlertBlocks_Example005()
+        {
+            // Example 5
+            // Section: Extensions / Alert Blocks
+            //
+            // The following Markdown:
+            //     > This is not a [!NOTE]
+            //     > Highlights information that users should take into account, even when skimming.
+            //
+            // Should be rendered as:
+            //     <blockquote>
+            //     <p>This is not a [!NOTE]
+            //     Highlights information that users should take into account, even when skimming.</p>
+            //     </blockquote>
+
+            TestParser.TestSpec("> This is not a [!NOTE]\n> Highlights information that users should take into account, even when skimming.", "<blockquote>\n<p>This is not a [!NOTE]\nHighlights information that users should take into account, even when skimming.</p>\n</blockquote>", "advanced", context: "Example 5\nSection Extensions / Alert Blocks\n");
+        }
+    }
+}

src/Markdig.Tests/Specs/AlertBlockSpecs.md

@@ -0,0 +1,127 @@
+# Extensions
+
+This section describes the different extensions supported:
+
+## Alert Blocks
+
+This is supporting the [GitHub Alert blocks](https://github.com/orgs/community/discussions/16925)
+
+```````````````````````````````` example
+> [!NOTE]  
+> Highlights information that users should take into account, even when skimming.
+
+> [!TIP]
+> Optional information to help a user be more successful.
+
+> [!IMPORTANT]  
+> Crucial information necessary for users to succeed.
+
+> [!WARNING]  
+> Critical content demanding immediate user attention due to potential risks.
+
+> [!CAUTION]
+> Negative potential consequences of an action.
+.
+<div class="markdown-alert markdown-alert-note">
+<p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p>
+<p>Highlights information that users should take into account, even when skimming.</p>
+</div>
+<div class="markdown-alert markdown-alert-tip">
+<p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M8 1.5c-2.363 0-4 1.69-4 3.75 0 .984.424 1.625.984 2.304l.214.253c.223.264.47.556.673.848.284.411.537.896.621 1.49a.75.75 0 0 1-1.484.211c-.04-.282-.163-.547-.37-.847a8.456 8.456 0 0 0-.542-.68c-.084-.1-.173-.205-.268-.32C3.201 7.75 2.5 6.766 2.5 5.25 2.5 2.31 4.863 0 8 0s5.5 2.31 5.5 5.25c0 1.516-.701 2.5-1.328 3.259-.095.115-.184.22-.268.319-.207.245-.383.453-.541.681-.208.3-.33.565-.37.847a.751.751 0 0 1-1.485-.212c.084-.593.337-1.078.621-1.489.203-.292.45-.584.673-.848.075-.088.147-.173.213-.253.561-.679.985-1.32.985-2.304 0-2.06-1.637-3.75-4-3.75ZM5.75 12h4.5a.75.75 0 0 1 0 1.5h-4.5a.75.75 0 0 1 0-1.5ZM6 15.25a.75.75 0 0 1 .75-.75h2.5a.75.75 0 0 1 0 1.5h-2.5a.75.75 0 0 1-.75-.75Z"></path></svg>Tip</p>
+<p>Optional information to help a user be more successful.</p>
+</div>
+<div class="markdown-alert markdown-alert-important">
+<p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>Important</p>
+<p>Crucial information necessary for users to succeed.</p>
+</div>
+<div class="markdown-alert markdown-alert-warning">
+<p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z"></path></svg>Warning</p>
+<p>Critical content demanding immediate user attention due to potential risks.</p>
+</div>
+<div class="markdown-alert markdown-alert-caution">
+<p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Caution</p>
+<p>Negative potential consequences of an action.</p>
+</div>
+````````````````````````````````
+
+Example with code blocks and mix formatting:
+
+
+```````````````````````````````` example
+> [!NOTE]
+> Highlights information that users should take into account, even when skimming.
+> Testing rendering for multiple lines
+> ```csharp
+> var test = "I can also add code to panels
+> ```
+> `Inline code testing`
+.
+<div class="markdown-alert markdown-alert-note">
+<p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p>
+<p>Highlights information that users should take into account, even when skimming.
+Testing rendering for multiple lines</p>
+<pre><code class="language-csharp">var test = &quot;I can also add code to panels
+</code></pre>
+<p><code>Inline code testing</code></p>
+</div>
+````````````````````````````````
+
+Multiline:
+
+```````````````````````````````` example
+> [!NOTE]
+> Highlights information that users should take into account, even when skimming.
+> 
+> Testing rendering for multiple lines
+> 
+> `Inline code testing`
+> 
+> Other line
+> 
+> > Nested quote
+> >
+> > Final nested quote line
+> 
+> Final line of alert
+.
+<div class="markdown-alert markdown-alert-note">
+<p class="markdown-alert-title"><svg viewBox="0 0 16 16" version="1.1" width="16" height="16" aria-hidden="true"><path d="M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z"></path></svg>Note</p>
+<p>Highlights information that users should take into account, even when skimming.</p>
+<p>Testing rendering for multiple lines</p>
+<p><code>Inline code testing</code></p>
+<p>Other line</p>
+<blockquote>
+<p>Nested quote</p>
+<p>Final nested quote line</p>
+</blockquote>
+<p>Final line of alert</p>
+</div>
+````````````````````````````````
+
+An alert inline (e.g `[!NOTE]`) must come first in a quote block, and must be followed by optional spaces with a new line. If no new lines are found, it will not be considered as an alert block.
+
+Followed by space and new line:
+
+```````````````````````````````` example
+> [!NOTE] This is invalid because no new line
+> Highlights information that users should take into account, even when skimming.
+.
+<blockquote>
+<p>[!NOTE] This is invalid because no new line
+Highlights information that users should take into account, even when skimming.</p>
+</blockquote>
+````````````````````````````````
+
+Must come first in a quote block:
+
+```````````````````````````````` example
+> This is not a [!NOTE]
+> Highlights information that users should take into account, even when skimming.
+.
+<blockquote>
+<p>This is not a [!NOTE]
+Highlights information that users should take into account, even when skimming.</p>
+</blockquote>
+````````````````````````````````
+
+

src/Markdig.Tests/Specs/AutoLinks.generated.cs

@@ -533,5 +533,28 @@ namespace Markdig.Tests.Specs.AutoLinks
 
             TestParser.TestSpec("<http://foö.bar.`baz>`", "<p><a href=\"http://xn--fo-gka.bar.%60baz\">http://foö.bar.`baz</a>`</p>", "autolinks|advanced", context: "Example 25\nSection Extensions / AutoLinks / Unicode support\n");
         }
+
+        // Unicode punctuation characters are not allowed, but symbols are.
+        // Note that this does _not_ exactly match CommonMark's "Unicode punctuation character" definition.
+        [Test]
+        public void ExtensionsAutoLinksUnicodeSupport_Example026()
+        {
+            // Example 26
+            // Section: Extensions / AutoLinks / Unicode support
+            //
+            // The following Markdown:
+            //     http://☃.net?☃ // OtherSymbol
+            //     
+            //     http://🍉.net?🍉 // A UTF-16 surrogate pair, but code point is OtherSymbol
+            //     
+            //     http://‰.net?‰ // OtherPunctuation
+            //
+            // Should be rendered as:
+            //     <p><a href="http://xn--n3h.net?%E2%98%83">http://☃.net?☃</a> // OtherSymbol</p>
+            //     <p><a href="http://xn--ji8h.net?%F0%9F%8D%89">http://🍉.net?🍉</a> // A UTF-16 surrogate pair, but code point is OtherSymbol</p>
+            //     <p>http://‰.net?‰ // OtherPunctuation</p>
+
+            TestParser.TestSpec("http://☃.net?☃ // OtherSymbol\n\nhttp://🍉.net?🍉 // A UTF-16 surrogate pair, but code point is OtherSymbol\n\nhttp://‰.net?‰ // OtherPunctuation", "<p><a href=\"http://xn--n3h.net?%E2%98%83\">http://☃.net?☃</a> // OtherSymbol</p>\n<p><a href=\"http://xn--ji8h.net?%F0%9F%8D%89\">http://🍉.net?🍉</a> // A UTF-16 surrogate pair, but code point is OtherSymbol</p>\n<p>http://‰.net?‰ // OtherPunctuation</p>", "autolinks|advanced", context: "Example 26\nSection Extensions / AutoLinks / Unicode support\n");
+        }
     }
 }

src/Markdig.Tests/Specs/AutoLinks.md

@@ -303,4 +303,19 @@ This will therefore be seen as an autolink and not as code inline.
 <http://foö.bar.`baz>`
 .
 <p><a href="http://xn--fo-gka.bar.%60baz">http://foö.bar.`baz</a>`</p>
+````````````````````````````````
+
+Unicode punctuation characters are not allowed, but symbols are.
+Note that this does _not_ exactly match CommonMark's "Unicode punctuation character" definition.
+
+```````````````````````````````` example
+http://☃.net?☃ // OtherSymbol
+
+http://🍉.net?🍉 // A UTF-16 surrogate pair, but code point is OtherSymbol
+
+http://‰.net?‰ // OtherPunctuation
+.
+<p><a href="http://xn--n3h.net?%E2%98%83">http://☃.net?☃</a> // OtherSymbol</p>
+<p><a href="http://xn--ji8h.net?%F0%9F%8D%89">http://🍉.net?🍉</a> // A UTF-16 surrogate pair, but code point is OtherSymbol</p>
+<p>http://‰.net?‰ // OtherPunctuation</p>
 ````````````````````````````````

src/Markdig.Tests/Specs/CommonMark.md

@@ -1,9 +1,9 @@
 ---
 title: CommonMark Spec
 author: John MacFarlane
-version: '0.30'
-date: '2021-06-19'
-license: '[CC-BY-SA 4.0](http://creativecommons.org/licenses/by-sa/4.0/)'
+version: '0.31.2'
+date: '2024-01-28'
+license: '[CC-BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)'
 ...
 
 # Introduction
@@ -14,7 +14,7 @@ Markdown is a plain text format for writing structured documents,
 based on conventions for indicating formatting in email
 and usenet posts.  It was developed by John Gruber (with
 help from Aaron Swartz) and released in 2004 in the form of a
-[syntax description](http://daringfireball.net/projects/markdown/syntax)
+[syntax description](https://daringfireball.net/projects/markdown/syntax)
 and a Perl script (`Markdown.pl`) for converting Markdown to
 HTML.  In the next decade, dozens of implementations were
 developed in many languages.  Some extended the original
@@ -34,10 +34,10 @@ As Gruber writes:
 > Markdown-formatted document should be publishable as-is, as
 > plain text, without looking like it's been marked up with tags
 > or formatting instructions.
-> (<http://daringfireball.net/projects/markdown/>)
+> (<https://daringfireball.net/projects/markdown/>)
 
 The point can be illustrated by comparing a sample of
-[AsciiDoc](http://www.methods.co.nz/asciidoc/) with
+[AsciiDoc](https://asciidoc.org/) with
 an equivalent sample of Markdown.  Here is a sample of
 AsciiDoc from the AsciiDoc manual:
 
@@ -103,7 +103,7 @@ source, not just in the processed document.
 ## Why is a spec needed?
 
 John Gruber's [canonical description of Markdown's
-syntax](http://daringfireball.net/projects/markdown/syntax)
+syntax](https://daringfireball.net/projects/markdown/syntax)
 does not specify the syntax unambiguously.  Here are some examples of
 questions it does not answer:
 
@@ -316,9 +316,9 @@ A line containing no characters, or a line containing only spaces
 
 The following definitions of character classes will be used in this spec:
 
-A [Unicode whitespace character](@) is
-any code point in the Unicode `Zs` general category, or a tab (`U+0009`),
-line feed (`U+000A`), form feed (`U+000C`), or carriage return (`U+000D`).
+A [Unicode whitespace character](@) is a character in the Unicode `Zs` general
+category, or a tab (`U+0009`), line feed (`U+000A`), form feed (`U+000C`), or
+carriage return (`U+000D`).
 
 [Unicode whitespace](@) is a sequence of one or more
 [Unicode whitespace characters].
@@ -337,9 +337,8 @@ is `!`, `"`, `#`, `$`, `%`, `&`, `'`, `(`, `)`,
 `[`, `\`, `]`, `^`, `_`, `` ` `` (U+005B–0060), 
 `{`, `|`, `}`, or `~` (U+007B–007E).
 
-A [Unicode punctuation character](@) is an [ASCII
-punctuation character] or anything in
-the general Unicode categories  `Pc`, `Pd`, `Pe`, `Pf`, `Pi`, `Po`, or `Ps`.
+A [Unicode punctuation character](@) is a character in the Unicode `P`
+(puncuation) or `S` (symbol) general categories.
 
 ## Tabs
 
@@ -579,9 +578,9 @@ raw HTML:
 
 
 ```````````````````````````````` example
-<http://example.com?find=\*>
+<https://example.com?find=\*>
 .
-<p><a href="http://example.com?find=%5C*">http://example.com?find=\*</a></p>
+<p><a href="https://example.com?find=%5C*">https://example.com?find=\*</a></p>
 ````````````````````````````````
 
 
@@ -1964,7 +1963,7 @@ has been found, the code block contains all of the lines after the
 opening code fence until the end of the containing block (or
 document).  (An alternative spec would require backtracking in the
 event that a closing code fence is not found.  But this makes parsing
-much less efficient, and there seems to be no real down side to the
+much less efficient, and there seems to be no real downside to the
 behavior described here.)
 
 A fenced code block may interrupt a paragraph, and does not require
@@ -2403,7 +2402,7 @@ followed by one of the strings (case-insensitive) `address`,
 `h1`, `h2`, `h3`, `h4`, `h5`, `h6`, `head`, `header`, `hr`,
 `html`, `iframe`, `legend`, `li`, `link`, `main`, `menu`, `menuitem`,
 `nav`, `noframes`, `ol`, `optgroup`, `option`, `p`, `param`,
-`section`, `source`, `summary`, `table`, `tbody`, `td`,
+`search`, `section`, `summary`, `table`, `tbody`, `td`,
 `tfoot`, `th`, `thead`, `title`, `tr`, `track`, `ul`, followed
 by a space, a tab, the end of the line, the string `>`, or
 the string `/>`.\
@@ -4115,7 +4114,7 @@ The following rules define [list items]:
     blocks *Bs* starting with a character other than a space or tab, and *M* is
     a list marker of width *W* followed by 1 ≤ *N* ≤ 4 spaces of indentation,
     then the result of prepending *M* and the following spaces to the first line
-    of Ls*, and indenting subsequent lines of *Ls* by *W + N* spaces, is a
+    of *Ls*, and indenting subsequent lines of *Ls* by *W + N* spaces, is a
     list item with *Bs* as its contents.  The type of the list item
     (bullet or ordered) is determined by the type of its list marker.
     If the list item is ordered, then it is also assigned a start
@@ -5350,11 +5349,11 @@ by itself should be a paragraph followed by a nested sublist.
 Since it is well established Markdown practice to allow lists to
 interrupt paragraphs inside list items, the [principle of
 uniformity] requires us to allow this outside list items as
-well.  ([reStructuredText](http://docutils.sourceforge.net/rst.html)
+well.  ([reStructuredText](https://docutils.sourceforge.net/rst.html)
 takes a different approach, requiring blank lines before lists
 even inside other list items.)
 
-In order to solve of unwanted lists in paragraphs with
+In order to solve the problem of unwanted lists in paragraphs with
 hard-wrapped numerals, we allow only lists starting with `1` to
 interrupt paragraphs.  Thus,
 
@@ -6055,18 +6054,18 @@ But this is an HTML tag:
 And this is code:
 
 ```````````````````````````````` example
-`<http://foo.bar.`baz>`
+`<https://foo.bar.`baz>`
 .
-<p><code>&lt;http://foo.bar.</code>baz&gt;`</p>
+<p><code>&lt;https://foo.bar.</code>baz&gt;`</p>
 ````````````````````````````````
 
 
 But this is an autolink:
 
 ```````````````````````````````` example
-<http://foo.bar.`baz>`
+<https://foo.bar.`baz>`
 .
-<p><a href="http://foo.bar.%60baz">http://foo.bar.`baz</a>`</p>
+<p><a href="https://foo.bar.%60baz">https://foo.bar.`baz</a>`</p>
 ````````````````````````````````
 
 
@@ -6099,7 +6098,7 @@ closing backtick strings to be equal in length:
 ## Emphasis and strong emphasis
 
 John Gruber's original [Markdown syntax
-description](http://daringfireball.net/projects/markdown/syntax#em) says:
+description](https://daringfireball.net/projects/markdown/syntax#em) says:
 
 > Markdown treats asterisks (`*`) and underscores (`_`) as indicators of
 > emphasis. Text wrapped with one `*` or `_` will be wrapped with an HTML
@@ -6201,7 +6200,7 @@ Here are some examples of delimiter runs.
 (The idea of distinguishing left-flanking and right-flanking
 delimiter runs based on the character before and the character
 after comes from Roopesh Chander's
-[vfmd](http://www.vfmd.org/vfmd-spec/specification/#procedure-for-identifying-emphasis-tags).
+[vfmd](https://web.archive.org/web/20220608143320/http://www.vfmd.org/vfmd-spec/specification/#procedure-for-identifying-emphasis-tags).
 vfmd uses the terminology "emphasis indicator string" instead of "delimiter
 run," and its rules for distinguishing left- and right-flanking runs
 are a bit more complex than the ones given here.)
@@ -6343,6 +6342,21 @@ Unicode nonbreaking spaces count as whitespace, too:
 ````````````````````````````````
 
 
+Unicode symbols count as punctuation, too:
+
+```````````````````````````````` example
+*$*alpha.
+
+*£*bravo.
+
+*€*charlie.
+.
+<p>*$*alpha.</p>
+<p>*£*bravo.</p>
+<p>*€*charlie.</p>
+````````````````````````````````
+
+
 Intraword emphasis with `*` is permitted:
 
 ```````````````````````````````` example
@@ -7428,16 +7442,16 @@ _a `_`_
 
 
 ```````````````````````````````` example
-**a<http://foo.bar/?q=**>
+**a<https://foo.bar/?q=**>
 .
-<p>**a<a href="http://foo.bar/?q=**">http://foo.bar/?q=**</a></p>
+<p>**a<a href="https://foo.bar/?q=**">https://foo.bar/?q=**</a></p>
 ````````````````````````````````
 
 
 ```````````````````````````````` example
-__a<http://foo.bar/?q=__>
+__a<https://foo.bar/?q=__>
 .
-<p>__a<a href="http://foo.bar/?q=__">http://foo.bar/?q=__</a></p>
+<p>__a<a href="https://foo.bar/?q=__">https://foo.bar/?q=__</a></p>
 ````````````````````````````````
 
 
@@ -7685,13 +7699,13 @@ A link can contain fragment identifiers and queries:
 ```````````````````````````````` example
 [link](#fragment)
 
-[link](http://example.com#fragment)
+[link](https://example.com#fragment)
 
-[link](http://example.com?foo=3#frag)
+[link](https://example.com?foo=3#frag)
 .
 <p><a href="#fragment">link</a></p>
-<p><a href="http://example.com#fragment">link</a></p>
-<p><a href="http://example.com?foo=3#frag">link</a></p>
+<p><a href="https://example.com#fragment">link</a></p>
+<p><a href="https://example.com?foo=3#frag">link</a></p>
 ````````````````````````````````
 
 
@@ -7935,9 +7949,9 @@ and autolinks over link grouping:
 
 
 ```````````````````````````````` example
-[foo<http://example.com/?search=](uri)>
+[foo<https://example.com/?search=](uri)>
 .
-<p>[foo<a href="http://example.com/?search=%5D(uri)">http://example.com/?search=](uri)</a></p>
+<p>[foo<a href="https://example.com/?search=%5D(uri)">https://example.com/?search=](uri)</a></p>
 ````````````````````````````````
 
 
@@ -8091,11 +8105,11 @@ and autolinks over link grouping:
 
 
 ```````````````````````````````` example
-[foo<http://example.com/?search=][ref]>
+[foo<https://example.com/?search=][ref]>
 
 [ref]: /uri
 .
-<p>[foo<a href="http://example.com/?search=%5D%5Bref%5D">http://example.com/?search=][ref]</a></p>
+<p>[foo<a href="https://example.com/?search=%5D%5Bref%5D">https://example.com/?search=][ref]</a></p>
 ````````````````````````````````
 
 
@@ -8295,7 +8309,7 @@ A [collapsed reference link](@)
 consists of a [link label] that [matches] a
 [link reference definition] elsewhere in the
 document, followed by the string `[]`.
-The contents of the first link label are parsed as inlines,
+The contents of the link label are parsed as inlines,
 which are used as the link's text.  The link's URI and title are
 provided by the matching reference link definition.  Thus,
 `[foo][]` is equivalent to `[foo][foo]`.
@@ -8348,7 +8362,7 @@ A [shortcut reference link](@)
 consists of a [link label] that [matches] a
 [link reference definition] elsewhere in the
 document and is not followed by `[]` or a link label.
-The contents of the first link label are parsed as inlines,
+The contents of the link label are parsed as inlines,
 which are used as the link's text.  The link's URI and title
 are provided by the matching link reference definition.
 Thus, `[foo]` is equivalent to `[foo][]`.
@@ -8435,7 +8449,7 @@ following closing bracket:
 ````````````````````````````````
 
 
-Full and compact references take precedence over shortcut
+Full and collapsed references take precedence over shortcut
 references:
 
 ```````````````````````````````` example
@@ -8771,9 +8785,9 @@ Here are some valid autolinks:
 
 
 ```````````````````````````````` example
-<http://foo.bar.baz/test?q=hello&id=22&boolean>
+<https://foo.bar.baz/test?q=hello&id=22&boolean>
 .
-<p><a href="http://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean">http://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean</a></p>
+<p><a href="https://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean">https://foo.bar.baz/test?q=hello&amp;id=22&amp;boolean</a></p>
 ````````````````````````````````
 
 
@@ -8813,9 +8827,9 @@ with their syntax:
 
 
 ```````````````````````````````` example
-<http://../>
+<https://../>
 .
-<p><a href="http://../">http://../</a></p>
+<p><a href="https://../">https://../</a></p>
 ````````````````````````````````
 
 
@@ -8829,18 +8843,18 @@ with their syntax:
 Spaces are not allowed in autolinks:
 
 ```````````````````````````````` example
-<http://foo.bar/baz bim>
+<https://foo.bar/baz bim>
 .
-<p>&lt;http://foo.bar/baz bim&gt;</p>
+<p>&lt;https://foo.bar/baz bim&gt;</p>
 ````````````````````````````````
 
 
 Backslash-escapes do not work inside autolinks:
 
 ```````````````````````````````` example
-<http://example.com/\[\>
+<https://example.com/\[\>
 .
-<p><a href="http://example.com/%5C%5B%5C">http://example.com/\[\</a></p>
+<p><a href="https://example.com/%5C%5B%5C">https://example.com/\[\</a></p>
 ````````````````````````````````
 
 
@@ -8892,9 +8906,9 @@ These are not autolinks:
 
 
 ```````````````````````````````` example
-< http://foo.bar >
+< https://foo.bar >
 .
-<p>&lt; http://foo.bar &gt;</p>
+<p>&lt; https://foo.bar &gt;</p>
 ````````````````````````````````
 
 
@@ -8913,9 +8927,9 @@ These are not autolinks:
 
 
 ```````````````````````````````` example
-http://example.com
+https://example.com
 .
-<p>http://example.com</p>
+<p>https://example.com</p>
 ````````````````````````````````
 
 
@@ -8977,10 +8991,9 @@ A [closing tag](@) consists of the string `</`, a
 [tag name], optional spaces, tabs, and up to one line ending, and the character
 `>`.
 
-An [HTML comment](@) consists of `<!--` + *text* + `-->`,
-where *text* does not start with `>` or `->`, does not end with `-`,
-and does not contain `--`.  (See the
-[HTML5 spec](http://www.w3.org/TR/html5/syntax.html#comments).)
+An [HTML comment](@) consists of `<!-->`, `<!--->`, or  `<!--`, a string of
+characters not including the string `-->`, and `-->` (see the
+[HTML spec](https://html.spec.whatwg.org/multipage/parsing.html#markup-declaration-open-state)).
 
 A [processing instruction](@)
 consists of the string `<?`, a string
@@ -9119,30 +9132,20 @@ Illegal attributes in closing tag:
 Comments:
 
 ```````````````````````````````` example
-foo <!-- this is a
-comment - with hyphen -->
+foo <!-- this is a --
+comment - with hyphens -->
 .
-<p>foo <!-- this is a
-comment - with hyphen --></p>
+<p>foo <!-- this is a --
+comment - with hyphens --></p>
 ````````````````````````````````
 
-
-```````````````````````````````` example
-foo <!-- not a comment -- two hyphens -->
-.
-<p>foo &lt;!-- not a comment -- two hyphens --&gt;</p>
-````````````````````````````````
-
-
-Not comments:
-
 ```````````````````````````````` example
 foo <!--> foo -->
 
-foo <!-- foo--->
+foo <!---> foo -->
 .
-<p>foo &lt;!--&gt; foo --&gt;</p>
-<p>foo &lt;!-- foo---&gt;</p>
+<p>foo <!--> foo --&gt;</p>
+<p>foo <!---> foo --&gt;</p>
 ````````````````````````````````
 
 
@@ -9671,7 +9674,7 @@ through the stack for an opening `[` or `![` delimiter.
   delimiter from the stack, and return a literal text node `]`.
 
 - If we find one and it's active, then we parse ahead to see if
-  we have an inline link/image, reference link/image, compact reference
+  we have an inline link/image, reference link/image, collapsed reference
   link/image, or shortcut reference link/image.
 
   + If we don't, then we remove the opening delimiter from the

src/Markdig.Tests/Specs/DiagramsSpecs.generated.cs

@@ -17,7 +17,7 @@ namespace Markdig.Tests.Specs.Diagrams
         // 
         // ## Mermaid diagrams
         //  
-        // Using a fenced code block with the `mermaid` language info will output a `<div class='mermaid'>` instead of a `pre/code` block:
+        // Using a fenced code block with the `mermaid` language info will output a `<pre class='mermaid'>` block (which is the default for other code block):
         [Test]
         public void ExtensionsMermaidDiagrams_Example001()
         {
@@ -34,14 +34,14 @@ namespace Markdig.Tests.Specs.Diagrams
             //     ```
             //
             // Should be rendered as:
-            //     <div class="mermaid">graph TD;
+            //     <pre class="mermaid">graph TD;
             //         A-->B;
             //         A-->C;
             //         B-->D;
             //         C-->D;
-            //     </div>
+            //     </pre>
 
-            TestParser.TestSpec("```mermaid\ngraph TD;\n    A-->B;\n    A-->C;\n    B-->D;\n    C-->D;\n```", "<div class=\"mermaid\">graph TD;\n    A-->B;\n    A-->C;\n    B-->D;\n    C-->D;\n</div>", "diagrams|advanced", context: "Example 1\nSection Extensions / Mermaid diagrams\n");
+            TestParser.TestSpec("```mermaid\ngraph TD;\n    A-->B;\n    A-->C;\n    B-->D;\n    C-->D;\n```", "<pre class=\"mermaid\">graph TD;\n    A-->B;\n    A-->C;\n    B-->D;\n    C-->D;\n</pre>", "diagrams|advanced", context: "Example 1\nSection Extensions / Mermaid diagrams\n");
         }
     }
 

src/Markdig.Tests/Specs/DiagramsSpecs.md

@@ -4,7 +4,7 @@ Adds support for diagrams extension:
 
 ## Mermaid diagrams
  
-Using a fenced code block with the `mermaid` language info will output a `<div class='mermaid'>` instead of a `pre/code` block:
+Using a fenced code block with the `mermaid` language info will output a `<pre class='mermaid'>` block (which is the default for other code block):
 
 ```````````````````````````````` example
 ```mermaid
@@ -15,12 +15,12 @@ graph TD;
     C-->D;
 ```
 .
-<div class="mermaid">graph TD;
+<pre class="mermaid">graph TD;
     A-->B;
     A-->C;
     B-->D;
     C-->D;
-</div>
+</pre>
 ````````````````````````````````
 
 ## nomnoml diagrams

src/Markdig.Tests/Specs/EmphasisExtraSpecs.generated.cs

@@ -123,6 +123,8 @@ namespace Markdig.Tests.Specs.EmphasisExtra
     public class TestExtensionsEmphasisOnHtmlEntities
     {
         // ## Emphasis on Html Entities
+        // 
+        // Note that Unicode symbols are treated as punctuation, which are not allowed to open the emphasis unless they are preceded by a space.
         [Test]
         public void ExtensionsEmphasisOnHtmlEntities_Example006()
         {
@@ -132,14 +134,14 @@ namespace Markdig.Tests.Specs.EmphasisExtra
             // The following Markdown:
             //     This is text MyBrand ^®^ and MyTrademark ^™^
             //     This is text MyBrand^®^ and MyTrademark^™^
-            //     This is text MyBrand~®~ and MyCopyright^©^
+            //     This is text MyBrand ~®~ and MyCopyright ^©^
             //
             // Should be rendered as:
             //     <p>This is text MyBrand <sup>®</sup> and MyTrademark <sup>TM</sup>
-            //     This is text MyBrand<sup>®</sup> and MyTrademark<sup>TM</sup>
-            //     This is text MyBrand<sub>®</sub> and MyCopyright<sup>©</sup></p>
+            //     This is text MyBrand^®^ and MyTrademark^TM^
+            //     This is text MyBrand <sub>®</sub> and MyCopyright <sup>©</sup></p>
 
-            TestParser.TestSpec("This is text MyBrand ^&reg;^ and MyTrademark ^&trade;^\nThis is text MyBrand^&reg;^ and MyTrademark^&trade;^\nThis is text MyBrand~&reg;~ and MyCopyright^&copy;^", "<p>This is text MyBrand <sup>®</sup> and MyTrademark <sup>TM</sup>\nThis is text MyBrand<sup>®</sup> and MyTrademark<sup>TM</sup>\nThis is text MyBrand<sub>®</sub> and MyCopyright<sup>©</sup></p>", "emphasisextras|advanced", context: "Example 6\nSection Extensions / Emphasis on Html Entities\n");
+            TestParser.TestSpec("This is text MyBrand ^&reg;^ and MyTrademark ^&trade;^\nThis is text MyBrand^&reg;^ and MyTrademark^&trade;^\nThis is text MyBrand ~&reg;~ and MyCopyright ^&copy;^", "<p>This is text MyBrand <sup>®</sup> and MyTrademark <sup>TM</sup>\nThis is text MyBrand^®^ and MyTrademark^TM^\nThis is text MyBrand <sub>®</sub> and MyCopyright <sup>©</sup></p>", "emphasisextras|advanced", context: "Example 6\nSection Extensions / Emphasis on Html Entities\n");
         }
     }
 }

src/Markdig.Tests/Specs/EmphasisExtraSpecs.md

@@ -52,16 +52,17 @@ Marked text can be used to specify that a text has been marked in a document.  T
 .
 <p><mark>Marked text</mark></p>
 ````````````````````````````````
+
 ## Emphasis on Html Entities
 
+Note that Unicode symbols are treated as punctuation, which are not allowed to open the emphasis unless they are preceded by a space.
 
 ```````````````````````````````` example
 This is text MyBrand ^&reg;^ and MyTrademark ^&trade;^
 This is text MyBrand^&reg;^ and MyTrademark^&trade;^
-This is text MyBrand~&reg;~ and MyCopyright^&copy;^
+This is text MyBrand ~&reg;~ and MyCopyright ^&copy;^
 .
 <p>This is text MyBrand <sup>®</sup> and MyTrademark <sup>TM</sup>
-This is text MyBrand<sup>®</sup> and MyTrademark<sup>TM</sup>
-This is text MyBrand<sub>®</sub> and MyCopyright<sup>©</sup></p>
+This is text MyBrand^®^ and MyTrademark^TM^
+This is text MyBrand <sub>®</sub> and MyCopyright <sup>©</sup></p>
 ````````````````````````````````
-

src/Markdig.Tests/Specs/GridTableSpecs.generated.cs

@@ -17,7 +17,8 @@ namespace Markdig.Tests.Specs.GridTables
         // 
         // ## Grid Table
         // 
-        // A grid table allows to have multiple lines per cells and allows to span cells over multiple columns. The following shows a simple grid table  
+        // A grid table allows having multiple lines per cells and allows spanning cells over multiple columns.
+        // The following shows a simple grid table:
         // 
         // ```
         // +---------+---------+
@@ -38,17 +39,20 @@ namespace Markdig.Tests.Specs.GridTables
         // ```
         // 
         // **Rule #1**
-        // The first line of a grid table must a **row separator**. It must start with the column separator character `+` used to separate columns in a row separator. Each column separator is:
-        //   - starting by optional spaces
-        //   - followed by an optional `:` to specify left align, followed by optional spaces
-        //   - followed by a sequence of at least one `-` character, followed by optional spaces
-        //   - followed by an optional `:` to specify right align (or center align if left align is also defined)
-        //   - ending by optional spaces
+        // The first line of a grid table must be a **row separator**.
+        // It must start with the column separator character `+` used to separate columns in a row separator.
         // 
-        // The first row separator must be followed by a *regular row*. A regular row must start with the character `|` that is starting at the same position than the column separator `+` of the first row separator.
+        // Each column separator:
+        // - starts with optional spaces
+        // - followed by an optional `:` to specify left align, followed by optional spaces
+        // - followed by a sequence of one or more `-` characters, followed by optional spaces
+        // - followed by an optional `:` to specify right align (or center align if left align is also defined)
+        // - ends with optional spaces
         // 
+        // The first row separator must be followed by a *regular row*.
+        // A regular row must start with a `|` character starting at the same position as the column separator `+` of the first row separator.
         // 
-        // The following is a valid row separator 
+        // The following is a valid row separator:
         [Test]
         public void ExtensionsGridTable_Example001()
         {
@@ -74,7 +78,7 @@ namespace Markdig.Tests.Specs.GridTables
             TestParser.TestSpec("+---------+---------+\n| This is | a table |", "<table>\n<col style=\"width:50%\" />\n<col style=\"width:50%\" />\n<tbody>\n<tr>\n<td>This is</td>\n<td>a table</td>\n</tr>\n</tbody>\n</table>", "gridtables|advanced", context: "Example 1\nSection Extensions / Grid Table\n");
         }
 
-        // The following is not a valid row separator 
+        // The following is not a valid row separator:
         [Test]
         public void ExtensionsGridTable_Example002()
         {
@@ -93,7 +97,8 @@ namespace Markdig.Tests.Specs.GridTables
         }
 
         // **Rule #2**
-        // A regular row can continue a previous regular row when column separator `|` are positioned at the same  position than the previous line. If they are positioned at the same location, the column may span over multiple columns:
+        // A regular row can continue a previous regular row when the column separators `|` are positioned at the same position as those of the previous line.
+        // If they are positioned at the same location, the column may span over multiple columns:
         [Test]
         public void ExtensionsGridTable_Example003()
         {
@@ -187,15 +192,13 @@ namespace Markdig.Tests.Specs.GridTables
             TestParser.TestSpec("+---------+---------+\n| This is | a table with a longer text in the second column", "<table>\n<col style=\"width:50%\" />\n<col style=\"width:50%\" />\n<tbody>\n<tr>\n<td>This is</td>\n<td>a table with a longer text in the second column</td>\n</tr>\n</tbody>\n</table>", "gridtables|advanced", context: "Example 5\nSection Extensions / Grid Table\n");
         }
 
-        // The respective width of the columns are calculated from the ratio between the total size of the first table row without counting the `+`: `+----+--------+----+` would be divided between:
+        // The respective widths of the columns are calculated from the ratio between the total size of the first table row without counting the `+`: `+----+--------+----+` would be divided between:
         // 
-        // Total size is : 16 
+        // - `----` → 4 characters
+        // - `--------` → 8 characters
+        // - `----` → 4 characters
         // 
-        // - `----` -> 4
-        // - `--------` -> 8
-        // - `----` -> 4
-        // 
-        // So the width would be 4/16 = 25%, 8/16 = 50%, 4/16 = 25%
+        // The total size is 16 characters, so the widths would be 4/16 = 25%, 8/16 = 50%, and 4/16 = 25%.
         [Test]
         public void ExtensionsGridTable_Example006()
         {
@@ -296,7 +299,7 @@ namespace Markdig.Tests.Specs.GridTables
             TestParser.TestSpec("+---+---+---+\n| AAAAA | B |\n+---+---+ B +\n| D | E | B |\n+ D +---+---+\n| D | CCCCC |\n+---+---+---+", "<table>\n<col style=\"width:33.33%\" />\n<col style=\"width:33.33%\" />\n<col style=\"width:33.33%\" />\n<tbody>\n<tr>\n<td colspan=\"2\">AAAAA</td>\n<td rowspan=\"2\">B\nB\nB</td>\n</tr>\n<tr>\n<td rowspan=\"2\">D\nD\nD</td>\n<td>E</td>\n</tr>\n<tr>\n<td colspan=\"2\">CCCCC</td>\n</tr>\n</tbody>\n</table>", "gridtables|advanced", context: "Example 8\nSection Extensions / Grid Table\n");
         }
 
-        // A grid table may have cells with both colspan and rowspan:
+        // A grid table may have cells with both `colspan` and `rowspan`:
         [Test]
         public void ExtensionsGridTable_Example009()
         {

src/Markdig.Tests/Specs/GridTableSpecs.md

@@ -4,7 +4,8 @@ This section describes the different extensions supported:
 
 ## Grid Table
 
-A grid table allows to have multiple lines per cells and allows to span cells over multiple columns. The following shows a simple grid table  
+A grid table allows having multiple lines per cells and allows spanning cells over multiple columns.
+The following shows a simple grid table:
 
 ```
 +---------+---------+
@@ -25,17 +26,20 @@ A grid table allows to have multiple lines per cells and allows to span cells ov
 ```
 
 **Rule #1**
-The first line of a grid table must a **row separator**. It must start with the column separator character `+` used to separate columns in a row separator. Each column separator is:
-  - starting by optional spaces
-  - followed by an optional `:` to specify left align, followed by optional spaces
-  - followed by a sequence of at least one `-` character, followed by optional spaces
-  - followed by an optional `:` to specify right align (or center align if left align is also defined)
-  - ending by optional spaces
+The first line of a grid table must be a **row separator**.
+It must start with the column separator character `+` used to separate columns in a row separator.
 
-The first row separator must be followed by a *regular row*. A regular row must start with the character `|` that is starting at the same position than the column separator `+` of the first row separator.
+Each column separator:
+- starts with optional spaces
+- followed by an optional `:` to specify left align, followed by optional spaces
+- followed by a sequence of one or more `-` characters, followed by optional spaces
+- followed by an optional `:` to specify right align (or center align if left align is also defined)
+- ends with optional spaces
 
+The first row separator must be followed by a *regular row*.
+A regular row must start with a `|` character starting at the same position as the column separator `+` of the first row separator.
 
-The following is a valid row separator 
+The following is a valid row separator:
 
 ```````````````````````````````` example
 +---------+---------+
@@ -53,8 +57,8 @@ The following is a valid row separator
 </table>
 ````````````````````````````````
 
+The following is not a valid row separator:
 
-The following is not a valid row separator 
 ```````````````````````````````` example
 |-----xxx----+---------+
 | This is    | not a table
@@ -64,7 +68,8 @@ The following is not a valid row separator
 ````````````````````````````````
 
 **Rule #2**
-A regular row can continue a previous regular row when column separator `|` are positioned at the same  position than the previous line. If they are positioned at the same location, the column may span over multiple columns:
+A regular row can continue a previous regular row when the column separators `|` are positioned at the same position as those of the previous line.
+If they are positioned at the same location, the column may span over multiple columns:
 
 ```````````````````````````````` example
 +---------+---------+---------+
@@ -134,15 +139,13 @@ The last column separator `|` may be omitted:
 </table>
 ````````````````````````````````
 
-The respective width of the columns are calculated from the ratio between the total size of the first table row without counting the `+`: `+----+--------+----+` would be divided between:
+The respective widths of the columns are calculated from the ratio between the total size of the first table row without counting the `+`: `+----+--------+----+` would be divided between:
 
-Total size is : 16 
+- `----` → 4 characters
+- `--------` → 8 characters
+- `----` → 4 characters
 
-- `----` -> 4
-- `--------` -> 8
-- `----` -> 4
-
-So the width would be 4/16 = 25%, 8/16 = 50%, 4/16 = 25%
+The total size is 16 characters, so the widths would be 4/16 = 25%, 8/16 = 50%, and 4/16 = 25%.
 
 ```````````````````````````````` example
 +----+--------+----+
@@ -165,7 +168,6 @@ So the width would be 4/16 = 25%, 8/16 = 50%, 4/16 = 25%
 
 Alignment might be specified on the first row using the character `:`:
 
-
 ```````````````````````````````` example
 +-----+:---:+-----+
 |  A  |  B  |  C  |
@@ -220,7 +222,7 @@ D</td>
 </table>
 ````````````````````````````````
 
-A grid table may have cells with both colspan and rowspan:
+A grid table may have cells with both `colspan` and `rowspan`:
 
 ```````````````````````````````` example
 +---+---+---+
@@ -276,7 +278,6 @@ A grid table may not have irregularly shaped cells:
 
 An empty `+` on a line should result in a simple empty list output:
 
-
 ```````````````````````````````` example
 +
 .

src/Markdig.Tests/Specs/MathSpecs.generated.cs

@@ -17,7 +17,7 @@ namespace Markdig.Tests.Specs.Math
         // 
         // ## Math Inline
         //  
-        // Allows to define a mathematic block embraced by `$...$`
+        // Allows to define a mathematic inline block embraced by `$...$`
         [Test]
         public void ExtensionsMathInline_Example001()
         {
@@ -25,12 +25,12 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is a $math block$
+            //     This is a $math inline$
             //
             // Should be rendered as:
-            //     <p>This is a <span class="math">\(math block\)</span></p>
+            //     <p>This is a <span class="math">\(math inline\)</span></p>
 
-            TestParser.TestSpec("This is a $math block$", "<p>This is a <span class=\"math\">\\(math block\\)</span></p>", "mathematics|advanced", context: "Example 1\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is a $math inline$", "<p>This is a <span class=\"math\">\\(math inline\\)</span></p>", "mathematics|advanced", context: "Example 1\nSection Extensions / Math Inline\n");
         }
 
         // Or by `$$...$$` embracing it by:
@@ -41,12 +41,12 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is a $$math block$$
+            //     This is a $$math inline$$
             //
             // Should be rendered as:
-            //     <p>This is a <span class="math">\(math block\)</span></p>
+            //     <p>This is a <span class="math">\(math inline\)</span></p>
 
-            TestParser.TestSpec("This is a $$math block$$", "<p>This is a <span class=\"math\">\\(math block\\)</span></p>", "mathematics|advanced", context: "Example 2\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is a $$math inline$$", "<p>This is a <span class=\"math\">\\(math inline\\)</span></p>", "mathematics|advanced", context: "Example 2\nSection Extensions / Math Inline\n");
         }
 
         // Newlines inside an inline math are not allowed:
@@ -58,13 +58,13 @@ namespace Markdig.Tests.Specs.Math
             //
             // The following Markdown:
             //     This is not a $$math 
-            //     block$$ and? this is a $$math block$$
+            //     inline$$ and? this is a $$math inline$$
             //
             // Should be rendered as:
             //     <p>This is not a $$math
-            //     block$$ and? this is a <span class="math">\(math block\)</span></p>
+            //     inline$$ and? this is a <span class="math">\(math inline\)</span></p>
 
-            TestParser.TestSpec("This is not a $$math \nblock$$ and? this is a $$math block$$", "<p>This is not a $$math\nblock$$ and? this is a <span class=\"math\">\\(math block\\)</span></p>", "mathematics|advanced", context: "Example 3\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is not a $$math \ninline$$ and? this is a $$math inline$$", "<p>This is not a $$math\ninline$$ and? this is a <span class=\"math\">\\(math inline\\)</span></p>", "mathematics|advanced", context: "Example 3\nSection Extensions / Math Inline\n");
         }
 
         [Test]
@@ -75,13 +75,13 @@ namespace Markdig.Tests.Specs.Math
             //
             // The following Markdown:
             //     This is not a $math 
-            //     block$ and? this is a $math block$
+            //     inline$ and? this is a $math inline$
             //
             // Should be rendered as:
             //     <p>This is not a $math
-            //     block$ and? this is a <span class="math">\(math block\)</span></p>
+            //     inline$ and? this is a <span class="math">\(math inline\)</span></p>
 
-            TestParser.TestSpec("This is not a $math \nblock$ and? this is a $math block$", "<p>This is not a $math\nblock$ and? this is a <span class=\"math\">\\(math block\\)</span></p>", "mathematics|advanced", context: "Example 4\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is not a $math \ninline$ and? this is a $math inline$", "<p>This is not a $math\ninline$ and? this is a <span class=\"math\">\\(math inline\\)</span></p>", "mathematics|advanced", context: "Example 4\nSection Extensions / Math Inline\n");
         }
 
         // An opening `$` can be followed by a space if the closing is also preceded by a space `$`:
@@ -92,12 +92,12 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is a $ math block $
+            //     This is a $ math inline $
             //
             // Should be rendered as:
-            //     <p>This is a <span class="math">\(math block\)</span></p>
+            //     <p>This is a <span class="math">\(math inline\)</span></p>
 
-            TestParser.TestSpec("This is a $ math block $", "<p>This is a <span class=\"math\">\\(math block\\)</span></p>", "mathematics|advanced", context: "Example 5\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is a $ math inline $", "<p>This is a <span class=\"math\">\\(math inline\\)</span></p>", "mathematics|advanced", context: "Example 5\nSection Extensions / Math Inline\n");
         }
 
         [Test]
@@ -107,12 +107,12 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is a $    math block     $ after
+            //     This is a $    math inline     $ after
             //
             // Should be rendered as:
-            //     <p>This is a <span class="math">\(math block\)</span> after</p>
+            //     <p>This is a <span class="math">\(math inline\)</span> after</p>
 
-            TestParser.TestSpec("This is a $    math block     $ after", "<p>This is a <span class=\"math\">\\(math block\\)</span> after</p>", "mathematics|advanced", context: "Example 6\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is a $    math inline     $ after", "<p>This is a <span class=\"math\">\\(math inline\\)</span> after</p>", "mathematics|advanced", context: "Example 6\nSection Extensions / Math Inline\n");
         }
 
         [Test]
@@ -122,12 +122,12 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is a $$    math block     $$ after
+            //     This is a $$    math inline     $$ after
             //
             // Should be rendered as:
-            //     <p>This is a <span class="math">\(math block\)</span> after</p>
+            //     <p>This is a <span class="math">\(math inline\)</span> after</p>
 
-            TestParser.TestSpec("This is a $$    math block     $$ after", "<p>This is a <span class=\"math\">\\(math block\\)</span> after</p>", "mathematics|advanced", context: "Example 7\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is a $$    math inline     $$ after", "<p>This is a <span class=\"math\">\\(math inline\\)</span> after</p>", "mathematics|advanced", context: "Example 7\nSection Extensions / Math Inline\n");
         }
 
         [Test]
@@ -137,12 +137,12 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is a not $ math block$ because there is not a whitespace before the closing
+            //     This is a not $ math inline$ because there is not a whitespace before the closing
             //
             // Should be rendered as:
-            //     <p>This is a not $ math block$ because there is not a whitespace before the closing</p>
+            //     <p>This is a not $ math inline$ because there is not a whitespace before the closing</p>
 
-            TestParser.TestSpec("This is a not $ math block$ because there is not a whitespace before the closing", "<p>This is a not $ math block$ because there is not a whitespace before the closing</p>", "mathematics|advanced", context: "Example 8\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is a not $ math inline$ because there is not a whitespace before the closing", "<p>This is a not $ math inline$ because there is not a whitespace before the closing</p>", "mathematics|advanced", context: "Example 8\nSection Extensions / Math Inline\n");
         }
 
         // For the opening `$` it requires a space or a punctuation before (but cannot be used within a word):
@@ -153,12 +153,12 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is not a m$ath block$
+            //     This is not a m$ath inline$
             //
             // Should be rendered as:
-            //     <p>This is not a m$ath block$</p>
+            //     <p>This is not a m$ath inline$</p>
 
-            TestParser.TestSpec("This is not a m$ath block$", "<p>This is not a m$ath block$</p>", "mathematics|advanced", context: "Example 9\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is not a m$ath inline$", "<p>This is not a m$ath inline$</p>", "mathematics|advanced", context: "Example 9\nSection Extensions / Math Inline\n");
         }
 
         // For the closing `$` it requires a space after or a punctuation (but cannot be preceded by a space and cannot be used within a word):
@@ -169,12 +169,12 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is not a $math bloc$k
+            //     This is not a $math inlin$e
             //
             // Should be rendered as:
-            //     <p>This is not a $math bloc$k</p>
+            //     <p>This is not a $math inlin$e</p>
 
-            TestParser.TestSpec("This is not a $math bloc$k", "<p>This is not a $math bloc$k</p>", "mathematics|advanced", context: "Example 10\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is not a $math inlin$e", "<p>This is not a $math inlin$e</p>", "mathematics|advanced", context: "Example 10\nSection Extensions / Math Inline\n");
         }
 
         // For the closing `$` it requires a space after or a punctuation (but cannot be preceded by a space and cannot be used within a word):
@@ -201,12 +201,12 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is a $math \$ block$
+            //     This is a $math \$ inline$
             //
             // Should be rendered as:
-            //     <p>This is a <span class="math">\(math \$ block\)</span></p>
+            //     <p>This is a <span class="math">\(math \$ inline\)</span></p>
 
-            TestParser.TestSpec("This is a $math \\$ block$", "<p>This is a <span class=\"math\">\\(math \\$ block\\)</span></p>", "mathematics|advanced", context: "Example 12\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is a $math \\$ inline$", "<p>This is a <span class=\"math\">\\(math \\$ inline\\)</span></p>", "mathematics|advanced", context: "Example 12\nSection Extensions / Math Inline\n");
         }
 
         // At most, two `$` will be matched for the opening and closing:
@@ -217,12 +217,12 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is a $$$math block$$$
+            //     This is a $$$math inline$$$
             //
             // Should be rendered as:
-            //     <p>This is a <span class="math">\($math block$\)</span></p>
+            //     <p>This is a <span class="math">\($math inline$\)</span></p>
 
-            TestParser.TestSpec("This is a $$$math block$$$", "<p>This is a <span class=\"math\">\\($math block$\\)</span></p>", "mathematics|advanced", context: "Example 13\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is a $$$math inline$$$", "<p>This is a <span class=\"math\">\\($math inline$\\)</span></p>", "mathematics|advanced", context: "Example 13\nSection Extensions / Math Inline\n");
         }
 
         // Regular text can come both before and after the math inline
@@ -233,15 +233,15 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is a $math block$ with text on both sides.
+            //     This is a $math inline$ with text on both sides.
             //
             // Should be rendered as:
-            //     <p>This is a <span class="math">\(math block\)</span> with text on both sides.</p>
+            //     <p>This is a <span class="math">\(math inline\)</span> with text on both sides.</p>
 
-            TestParser.TestSpec("This is a $math block$ with text on both sides.", "<p>This is a <span class=\"math\">\\(math block\\)</span> with text on both sides.</p>", "mathematics|advanced", context: "Example 14\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is a $math inline$ with text on both sides.", "<p>This is a <span class=\"math\">\\(math inline\\)</span> with text on both sides.</p>", "mathematics|advanced", context: "Example 14\nSection Extensions / Math Inline\n");
         }
 
-        // A mathematic block takes precedence over standard emphasis `*` `_`:
+        // A mathematic inline block takes precedence over standard emphasis `*` `_`:
         [Test]
         public void ExtensionsMathInline_Example015()
         {
@@ -249,15 +249,15 @@ namespace Markdig.Tests.Specs.Math
             // Section: Extensions / Math Inline
             //
             // The following Markdown:
-            //     This is *a $math* block$
+            //     This is *a $math* inline$
             //
             // Should be rendered as:
-            //     <p>This is *a <span class="math">\(math* block\)</span></p>
+            //     <p>This is *a <span class="math">\(math* inline\)</span></p>
 
-            TestParser.TestSpec("This is *a $math* block$", "<p>This is *a <span class=\"math\">\\(math* block\\)</span></p>", "mathematics|advanced", context: "Example 15\nSection Extensions / Math Inline\n");
+            TestParser.TestSpec("This is *a $math* inline$", "<p>This is *a <span class=\"math\">\\(math* inline\\)</span></p>", "mathematics|advanced", context: "Example 15\nSection Extensions / Math Inline\n");
         }
 
-        // An opening $$ at the beginning of a line should not be interpreted as a Math block:
+        // An opening $$ at the beginning of a line should not be interpreted as a Math inline:
         [Test]
         public void ExtensionsMathInline_Example016()
         {
@@ -279,7 +279,7 @@ namespace Markdig.Tests.Specs.Math
     {
         // ## Math Block
         // 
-        // The match block can spawn on multiple lines by having a $$ starting on a line.
+        // The math block can spawn on multiple lines by having a $$ starting on a line.
         // It is working as a fenced code block.
         [Test]
         public void ExtensionsMathBlock_Example017()

src/Markdig.Tests/Specs/MathSpecs.md

@@ -4,79 +4,79 @@ Adds support for mathematics spans:
 
 ## Math Inline
  
-Allows to define a mathematic block embraced by `$...$`
+Allows to define a mathematic inline block embraced by `$...$`
 
 ```````````````````````````````` example
-This is a $math block$
+This is a $math inline$
 .
-<p>This is a <span class="math">\(math block\)</span></p>
+<p>This is a <span class="math">\(math inline\)</span></p>
 ````````````````````````````````
 
 Or by `$$...$$` embracing it by:
 
 ```````````````````````````````` example
-This is a $$math block$$
+This is a $$math inline$$
 .
-<p>This is a <span class="math">\(math block\)</span></p>
+<p>This is a <span class="math">\(math inline\)</span></p>
 ````````````````````````````````
 
 Newlines inside an inline math are not allowed:
 
 ```````````````````````````````` example
 This is not a $$math 
-block$$ and? this is a $$math block$$
+inline$$ and? this is a $$math inline$$
 .
 <p>This is not a $$math
-block$$ and? this is a <span class="math">\(math block\)</span></p>
+inline$$ and? this is a <span class="math">\(math inline\)</span></p>
 ````````````````````````````````
 
 ```````````````````````````````` example
 This is not a $math 
-block$ and? this is a $math block$
+inline$ and? this is a $math inline$
 .
 <p>This is not a $math
-block$ and? this is a <span class="math">\(math block\)</span></p>
+inline$ and? this is a <span class="math">\(math inline\)</span></p>
 ````````````````````````````````
 An opening `$` can be followed by a space if the closing is also preceded by a space `$`:
 
 ```````````````````````````````` example
-This is a $ math block $
+This is a $ math inline $
 .
-<p>This is a <span class="math">\(math block\)</span></p>
+<p>This is a <span class="math">\(math inline\)</span></p>
 ````````````````````````````````
 
 ```````````````````````````````` example
-This is a $    math block     $ after
+This is a $    math inline     $ after
 .
-<p>This is a <span class="math">\(math block\)</span> after</p>
+<p>This is a <span class="math">\(math inline\)</span> after</p>
 ````````````````````````````````
 
 ```````````````````````````````` example
-This is a $$    math block     $$ after
+This is a $$    math inline     $$ after
 .
-<p>This is a <span class="math">\(math block\)</span> after</p>
+<p>This is a <span class="math">\(math inline\)</span> after</p>
 ````````````````````````````````
 
 ```````````````````````````````` example
-This is a not $ math block$ because there is not a whitespace before the closing
+This is a not $ math inline$ because there is not a whitespace before the closing
 .
-<p>This is a not $ math block$ because there is not a whitespace before the closing</p>
+<p>This is a not $ math inline$ because there is not a whitespace before the closing</p>
 ````````````````````````````````
 
 For the opening `$` it requires a space or a punctuation before (but cannot be used within a word):
 
 ```````````````````````````````` example
-This is not a m$ath block$
+This is not a m$ath inline$
 .
-<p>This is not a m$ath block$</p>
+<p>This is not a m$ath inline$</p>
 ````````````````````````````````
 
 For the closing `$` it requires a space after or a punctuation (but cannot be preceded by a space and cannot be used within a word):
 
 ```````````````````````````````` example
-This is not a $math bloc$k
+This is not a $math inlin$e
 .
-<p>This is not a $math bloc$k</p>
+<p>This is not a $math inlin$e</p>
 ````````````````````````````````
 
 For the closing `$` it requires a space after or a punctuation (but cannot be preceded by a space and cannot be used within a word):
@@ -90,34 +90,34 @@ This is should not match a 16$ or a $15
 A `$` can be escaped between a math inline block by using the escape `\\` 
 
 ```````````````````````````````` example
-This is a $math \$ block$
+This is a $math \$ inline$
 .
-<p>This is a <span class="math">\(math \$ block\)</span></p>
+<p>This is a <span class="math">\(math \$ inline\)</span></p>
 ````````````````````````````````
 
 At most, two `$` will be matched for the opening and closing:
 
 ```````````````````````````````` example
-This is a $$$math block$$$
+This is a $$$math inline$$$
 .
-<p>This is a <span class="math">\($math block$\)</span></p>
+<p>This is a <span class="math">\($math inline$\)</span></p>
 ````````````````````````````````
 
 Regular text can come both before and after the math inline
 
 ```````````````````````````````` example
-This is a $math block$ with text on both sides.
+This is a $math inline$ with text on both sides.
 .
-<p>This is a <span class="math">\(math block\)</span> with text on both sides.</p>
+<p>This is a <span class="math">\(math inline\)</span> with text on both sides.</p>
 ````````````````````````````````
-A mathematic block takes precedence over standard emphasis `*` `_`:
+A mathematic inline block takes precedence over standard emphasis `*` `_`:
 
 ```````````````````````````````` example
-This is *a $math* block$
+This is *a $math* inline$
 .
-<p>This is *a <span class="math">\(math* block\)</span></p>
+<p>This is *a <span class="math">\(math* inline\)</span></p>
 ````````````````````````````````
-An opening $$ at the beginning of a line should not be interpreted as a Math block:
+An opening $$ at the beginning of a line should not be interpreted as a Math inline:
 
 ```````````````````````````````` example
 $$ math $$ starting at a line
@@ -127,7 +127,7 @@ $$ math $$ starting at a line
 
 ## Math Block
 
-The match block can spawn on multiple lines by having a $$ starting on a line.
+The math block can spawn on multiple lines by having a $$ starting on a line.
 It is working as a fenced code block.
 
 ```````````````````````````````` example

src/Markdig.Tests/TestAutoLinks.cs

@@ -0,0 +1,24 @@
+using Markdig.Extensions.AutoLinks;
+
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestAutoLinks
+{
+    [Test]
+    [TestCase("https://localhost", "<p><a href=\"https://localhost\">https://localhost</a></p>")]
+    [TestCase("http://localhost", "<p><a href=\"http://localhost\">http://localhost</a></p>")]
+    [TestCase("https://l", "<p><a href=\"https://l\">https://l</a></p>")]
+    [TestCase("www.l", "<p><a href=\"http://www.l\">www.l</a></p>")]
+    [TestCase("https://localhost:5000", "<p><a href=\"https://localhost:5000\">https://localhost:5000</a></p>")]
+    [TestCase("www.l:5000", "<p><a href=\"http://www.l:5000\">www.l:5000</a></p>")]
+    public void TestLinksWithAllowDomainWithoutPeriod(string markdown, string expected)
+    {
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseAutoLinks(new AutoLinkOptions { AllowDomainWithoutPeriod = true })
+            .Build();
+        var html = Markdown.ToHtml(markdown, pipeline);
+
+        Assert.That(html, Is.EqualTo(expected).IgnoreWhiteSpace);
+    }
+}

src/Markdig.Tests/TestCharHelper.cs

@@ -1,91 +1,261 @@
-using System.Collections.Generic;
 using System.Globalization;
+
 using Markdig.Helpers;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestCharHelper
 {
-    public class TestCharHelper
+    // An ASCII punctuation character is
+    // !, ", #, $, %, &, ', (, ), *, +, ,, -, ., / (U+0021–2F),
+    // :, ;, <, =, >, ?, @ (U+003A–0040),
+    // [, \, ], ^, _, ` (U+005B–0060),
+    // {, |, }, or ~ (U+007B–007E).
+    private static readonly HashSet<char> s_asciiPunctuation = new()
     {
-        // An ASCII punctuation character is
-        // !, ", #, $, %, &, ', (, ), *, +, ,, -, ., / (U+0021–2F),
-        // :, ;, <, =, >, ?, @ (U+003A–0040),
-        // [, \, ], ^, _, ` (U+005B–0060),
-        // {, |, }, or ~ (U+007B–007E).
-        private static readonly HashSet<char> s_asciiPunctuation = new()
-        {
-            '!', '"', '#', '$', '%', '&', '\'', '(', ')', '*', '+', ',', '-', '.', '/',
-            ':', ';', '<', '=', '>', '?', '@',
-            '[', '\\', ']', '^', '_', '`',
-            '{', '|', '}', '~'
-        };
+        '!', '"', '#', '$', '%', '&', '\'', '(', ')', '*', '+', ',', '-', '.', '/',
+        ':', ';', '<', '=', '>', '?', '@',
+        '[', '\\', ']', '^', '_', '`',
+        '{', '|', '}', '~'
+    };
 
-        // A Unicode punctuation character is an ASCII punctuation character or anything in the general Unicode categories
-        // Pc, Pd, Pe, Pf, Pi, Po, or Ps.
-        private static readonly HashSet<UnicodeCategory> s_punctuationCategories = new()
-        {
-            UnicodeCategory.ConnectorPunctuation,
-            UnicodeCategory.DashPunctuation,
-            UnicodeCategory.ClosePunctuation,
-            UnicodeCategory.FinalQuotePunctuation,
-            UnicodeCategory.InitialQuotePunctuation,
-            UnicodeCategory.OtherPunctuation,
-            UnicodeCategory.OpenPunctuation
-        };
+    // A Unicode punctuation character is a character in the Unicode P (punctuation) or S (symbol) general categories.
+    private static readonly HashSet<UnicodeCategory> s_punctuationCategories =
+    [
+        UnicodeCategory.ConnectorPunctuation,
+        UnicodeCategory.DashPunctuation,
+        UnicodeCategory.OpenPunctuation,
+        UnicodeCategory.ClosePunctuation,
+        UnicodeCategory.InitialQuotePunctuation,
+        UnicodeCategory.FinalQuotePunctuation,
+        UnicodeCategory.OtherPunctuation,
+        UnicodeCategory.MathSymbol,
+        UnicodeCategory.CurrencySymbol,
+        UnicodeCategory.ModifierSymbol,
+        UnicodeCategory.OtherSymbol,
+    ];
 
-        private static bool ExpectedIsPunctuation(char c)
+    private static readonly HashSet<UnicodeCategory> s_punctuationWithoutSymbolsCategories =
+    [
+        UnicodeCategory.ConnectorPunctuation,
+        UnicodeCategory.DashPunctuation,
+        UnicodeCategory.OpenPunctuation,
+        UnicodeCategory.ClosePunctuation,
+        UnicodeCategory.InitialQuotePunctuation,
+        UnicodeCategory.FinalQuotePunctuation,
+        UnicodeCategory.OtherPunctuation,
+    ];
+
+    private static bool ExpectedIsPunctuation(char c)
+    {
+        return c <= 127
+            ? s_asciiPunctuation.Contains(c)
+            : s_punctuationCategories.Contains(CharUnicodeInfo.GetUnicodeCategory(c));
+    }
+
+    private static bool ExpectedIsPunctuationWithoutSymbols(char c)
+    {
+        return c <= 127
+            ? s_asciiPunctuation.Contains(c)
+            : s_punctuationWithoutSymbolsCategories.Contains(CharUnicodeInfo.GetUnicodeCategory(c));
+    }
+
+    private static bool ExpectedIsWhitespace(char c)
+    {
+        // A Unicode whitespace character is any code point in the Unicode Zs general category,
+        // or a tab (U+0009), line feed (U+000A), form feed (U+000C), or carriage return (U+000D).
+        return c == '\t' || c == '\n' || c == '\f' || c == '\r' ||
+            CharUnicodeInfo.GetUnicodeCategory(c) == UnicodeCategory.SpaceSeparator;
+    }
+
+    [Test]
+    public void IsAcrossTab()
+    {
+        Assert.False(CharHelper.IsAcrossTab(0));
+        Assert.True(CharHelper.IsAcrossTab(1));
+        Assert.True(CharHelper.IsAcrossTab(2));
+        Assert.True(CharHelper.IsAcrossTab(3));
+        Assert.False(CharHelper.IsAcrossTab(4));
+    }
+
+    [Test]
+    public void AddTab()
+    {
+        Assert.AreEqual(4, CharHelper.AddTab(0));
+        Assert.AreEqual(4, CharHelper.AddTab(1));
+        Assert.AreEqual(4, CharHelper.AddTab(2));
+        Assert.AreEqual(4, CharHelper.AddTab(3));
+        Assert.AreEqual(8, CharHelper.AddTab(4));
+        Assert.AreEqual(8, CharHelper.AddTab(5));
+    }
+
+    [Test]
+    public void IsWhitespace()
+    {
+        Test(
+            ExpectedIsWhitespace,
+            CharHelper.IsWhitespace);
+
+        Test(
+            ExpectedIsWhitespace,
+            CharHelper.WhitespaceChars.Contains);
+    }
+
+    [Test]
+    public void IsWhiteSpaceOrZero()
+    {
+        Test(
+            c => ExpectedIsWhitespace(c) || c == 0,
+            CharHelper.IsWhiteSpaceOrZero);
+    }
+
+    [Test]
+    public void IsAsciiPunctuation()
+    {
+        Test(
+            c => char.IsAscii(c) && ExpectedIsPunctuation(c),
+            CharHelper.IsAsciiPunctuation);
+    }
+
+    [Test]
+    public void IsAsciiPunctuationOrZero()
+    {
+        Test(
+            c => char.IsAscii(c) && (ExpectedIsPunctuation(c) || c == 0),
+            CharHelper.IsAsciiPunctuationOrZero);
+    }
+
+    [Test]
+    public void IsSpaceOrPunctuationForGFMAutoLink()
+    {
+        Test(
+            c => c == 0 || ExpectedIsWhitespace(c) || ExpectedIsPunctuationWithoutSymbols(c),
+            CharHelper.IsSpaceOrPunctuationForGFMAutoLink);
+    }
+
+    [Test]
+    public void InvalidAutoLinkCharacters()
+    {
+        // 6.5 Autolinks - https://spec.commonmark.org/0.31.2/#autolinks
+        // An absolute URI, for these purposes, consists of a scheme followed by a colon (:) followed by
+        // zero or more characters other than ASCII control characters, space, <, and >.
+        //
+        // 2.1 Characters and lines
+        // An ASCII control character is a character between U+0000–1F (both including) or U+007F.
+        Test(
+            c => c != 0 && c is < (char)0x20 or ' ' or '<' or '>' or '\u007F',
+            CharHelper.InvalidAutoLinkCharacters.Contains);
+    }
+
+    [Test]
+    public void CheckUnicodeCategory()
+    {
+        for (int i = char.MinValue; i <= char.MaxValue; i++)
         {
-            return c <= 127
-                ? s_asciiPunctuation.Contains(c)
-                : s_punctuationCategories.Contains(CharUnicodeInfo.GetUnicodeCategory(c));
+            char c = (char)i;
+
+            bool expectedSpace = c == 0 || ExpectedIsWhitespace(c);
+            bool expectedPunctuation = c == 0 || ExpectedIsPunctuation(c);
+
+            CharHelper.CheckUnicodeCategory(c, out bool spaceActual, out bool punctuationActual);
+
+            Assert.AreEqual(expectedSpace, spaceActual);
+            Assert.AreEqual(expectedPunctuation, punctuationActual);
         }
+    }
 
-        private static bool ExpectedIsWhitespace(char c)
-        {
-            // A Unicode whitespace character is any code point in the Unicode Zs general category,
-            // or a tab (U+0009), line feed (U+000A), form feed (U+000C), or carriage return (U+000D).
-            return c == '\t' || c == '\n' || c == '\u000C' || c == '\r' ||
-                CharUnicodeInfo.GetUnicodeCategory(c) == UnicodeCategory.SpaceSeparator;
-        }
+    [Test]
+    public void IsControl()
+    {
+        Test(
+            char.IsControl,
+            CharHelper.IsControl);
+    }
 
-        [Test]
-        public void IsWhitespace()
+    [Test]
+    public void IsAlpha()
+    {
+        Test(
+            c => (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'),
+            CharHelper.IsAlpha);
+    }
+
+    [Test]
+    public void IsAlphaUpper()
+    {
+        Test(
+            c => c >= 'A' && c <= 'Z',
+            CharHelper.IsAlphaUpper);
+    }
+
+    [Test]
+    public void IsAlphaNumeric()
+    {
+        Test(
+            c => (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9'),
+            CharHelper.IsAlphaNumeric);
+    }
+
+    [Test]
+    public void IsDigit()
+    {
+        Test(
+            c => c >= '0' && c <= '9',
+            CharHelper.IsDigit);
+    }
+
+    [Test]
+    public void IsNewLineOrLineFeed()
+    {
+        Test(
+            c => c is '\r' or '\n',
+            CharHelper.IsNewLineOrLineFeed);
+    }
+
+    [Test]
+    public void IsSpaceOrTab()
+    {
+        Test(
+            c => c is ' ' or '\t',
+            CharHelper.IsSpaceOrTab);
+    }
+
+    [Test]
+    public void IsEscapableSymbol()
+    {
+        Test(
+            "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~•".Contains,
+            CharHelper.IsEscapableSymbol);
+    }
+
+    [Test]
+    public void IsEmailUsernameSpecialChar()
+    {
+        Test(
+            ".!#$%&'*+/=?^_`{|}~-+.~".Contains,
+            CharHelper.IsEmailUsernameSpecialChar);
+    }
+
+    [Test]
+    public void IsEmailUsernameSpecialCharOrDigit()
+    {
+        Test(
+            c => CharHelper.IsDigit(c) || ".!#$%&'*+/=?^_`{|}~-+.~".Contains(c),
+            CharHelper.IsEmailUsernameSpecialCharOrDigit);
+    }
+
+    private static void Test(Func<char, bool> expected, Func<char, bool> actual)
+    {
+        for (int i = char.MinValue; i <= char.MaxValue; i++)
         {
-            for (int i = char.MinValue; i <= char.MaxValue; i++)
+            char c = (char)i;
+
+            bool expectedResult = expected(c);
+            bool actualResult = actual(c);
+
+            if (expectedResult != actualResult)
             {
-                char c = (char)i;
-
-                Assert.AreEqual(ExpectedIsWhitespace(c), CharHelper.IsWhitespace(c));
-            }
-        }
-
-        [Test]
-        public void CheckUnicodeCategory()
-        {
-            for (int i = char.MinValue; i <= char.MaxValue; i++)
-            {
-                char c = (char)i;
-
-                bool expectedSpace = c == 0 || ExpectedIsWhitespace(c);
-                bool expectedPunctuation = c == 0 || ExpectedIsPunctuation(c);
-
-                CharHelper.CheckUnicodeCategory(c, out bool spaceActual, out bool punctuationActual);
-
-                Assert.AreEqual(expectedSpace, spaceActual);
-                Assert.AreEqual(expectedPunctuation, punctuationActual);
-            }
-        }
-
-        [Test]
-        public void IsSpaceOrPunctuation()
-        {
-            for (int i = char.MinValue; i <= char.MaxValue; i++)
-            {
-                char c = (char)i;
-
-                bool expected = c == 0 || ExpectedIsWhitespace(c) || ExpectedIsPunctuation(c);
-
-                Assert.AreEqual(expected, CharHelper.IsSpaceOrPunctuation(c));
+                Assert.AreEqual(expectedResult, actualResult, $"Char: '{c}' ({i})");
             }
         }
     }

src/Markdig.Tests/TestConfigureNewLine.cs

@@ -1,42 +1,39 @@
-using NUnit.Framework;
+namespace Markdig.Tests;
 
-namespace Markdig.Tests
+[TestFixture]
+public class TestConfigureNewLine
 {
-    [TestFixture]
-    public class TestConfigureNewLine
+    [Test]
+    [TestCase(/* newLineForWriting: */ "\n",   /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "<p><em>1</em>\n<em>2</em></p>\n")]
+    [TestCase(/* newLineForWriting: */ "\n",   /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "<p><em>1</em>\n<em>2</em></p>\n")]
+    [TestCase(/* newLineForWriting: */ "\r\n", /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "<p><em>1</em>\r\n<em>2</em></p>\r\n")]
+    [TestCase(/* newLineForWriting: */ "\r\n", /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "<p><em>1</em>\r\n<em>2</em></p>\r\n")]
+    [TestCase(/* newLineForWriting: */ "!!!" , /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "<p><em>1</em>!!!<em>2</em></p>!!!")]
+    [TestCase(/* newLineForWriting: */ "!!!" , /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "<p><em>1</em>!!!<em>2</em></p>!!!")]
+    public void TestHtmlOutputWhenConfiguringNewLine(string newLineForWriting, string markdownText, string expected)
     {
-        [Test]
-        [TestCase(/* newLineForWriting: */ "\n",   /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "<p><em>1</em>\n<em>2</em></p>\n")]
-        [TestCase(/* newLineForWriting: */ "\n",   /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "<p><em>1</em>\n<em>2</em></p>\n")]
-        [TestCase(/* newLineForWriting: */ "\r\n", /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "<p><em>1</em>\r\n<em>2</em></p>\r\n")]
-        [TestCase(/* newLineForWriting: */ "\r\n", /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "<p><em>1</em>\r\n<em>2</em></p>\r\n")]
-        [TestCase(/* newLineForWriting: */ "!!!" , /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "<p><em>1</em>!!!<em>2</em></p>!!!")]
-        [TestCase(/* newLineForWriting: */ "!!!" , /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "<p><em>1</em>!!!<em>2</em></p>!!!")]
-        public void TestHtmlOutputWhenConfiguringNewLine(string newLineForWriting, string markdownText, string expected)
-        {
-            var pipeline = new MarkdownPipelineBuilder()
-                .ConfigureNewLine(newLineForWriting)
-                .Build();
+        var pipeline = new MarkdownPipelineBuilder()
+            .ConfigureNewLine(newLineForWriting)
+            .Build();
 
-            var actual = Markdown.ToHtml(markdownText, pipeline);
-            Assert.AreEqual(expected, actual);
-        }
+        var actual = Markdown.ToHtml(markdownText, pipeline);
+        Assert.AreEqual(expected, actual);
+    }
 
-        [Test]
-        [TestCase(/* newLineForWriting: */ "\n",   /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "1\n2\n")]
-        [TestCase(/* newLineForWriting: */ "\n",   /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "1\n2\n")]
-        [TestCase(/* newLineForWriting: */ "\r\n", /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "1\r\n2\r\n")]
-        [TestCase(/* newLineForWriting: */ "\r\n", /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "1\r\n2\r\n")]
-        [TestCase(/* newLineForWriting: */ "!!!", /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "1!!!2!!!")]
-        [TestCase(/* newLineForWriting: */ "!!!", /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "1!!!2!!!")]
-        public void TestPlainOutputWhenConfiguringNewLine(string newLineForWriting, string markdownText, string expected)
-        {
-            var pipeline = new MarkdownPipelineBuilder()
-                .ConfigureNewLine(newLineForWriting)
-                .Build();
+    [Test]
+    [TestCase(/* newLineForWriting: */ "\n",   /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "1\n2\n")]
+    [TestCase(/* newLineForWriting: */ "\n",   /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "1\n2\n")]
+    [TestCase(/* newLineForWriting: */ "\r\n", /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "1\r\n2\r\n")]
+    [TestCase(/* newLineForWriting: */ "\r\n", /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "1\r\n2\r\n")]
+    [TestCase(/* newLineForWriting: */ "!!!", /* markdownText: */ "*1*\n*2*\n",     /* expected: */ "1!!!2!!!")]
+    [TestCase(/* newLineForWriting: */ "!!!", /* markdownText: */ "*1*\r\n*2*\r\n", /* expected: */ "1!!!2!!!")]
+    public void TestPlainOutputWhenConfiguringNewLine(string newLineForWriting, string markdownText, string expected)
+    {
+        var pipeline = new MarkdownPipelineBuilder()
+            .ConfigureNewLine(newLineForWriting)
+            .Build();
 
-            var actual = Markdown.ToPlainText(markdownText, pipeline);
-            Assert.AreEqual(expected, actual);
-        }
+        var actual = Markdown.ToPlainText(markdownText, pipeline);
+        Assert.AreEqual(expected, actual);
     }
 }

src/Markdig.Tests/TestContainerBlocks.cs

@@ -1,189 +1,186 @@
-using System;
 using Markdig.Syntax;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestContainerBlocks
 {
-    public class TestContainerBlocks
+    private class MockContainerBlock : ContainerBlock
     {
-        private class MockContainerBlock : ContainerBlock
+        public MockContainerBlock()
+            : base(null)
         {
-            public MockContainerBlock()
-                : base(null)
-            {
 
-            }
-        }
-
-        [Test]
-        public void CanBeCleared()
-        {
-            ContainerBlock container = new MockContainerBlock();
-            Assert.AreEqual(0, container.Count);
-            Assert.Null(container.LastChild);
-
-            var paragraph = new ParagraphBlock();
-            Assert.Null(paragraph.Parent);
-
-            container.Add(paragraph);
-
-            Assert.AreEqual(1, container.Count);
-            Assert.AreSame(container, paragraph.Parent);
-            Assert.AreSame(paragraph, container.LastChild);
-
-            container.Clear();
-
-            Assert.AreEqual(0, container.Count);
-            Assert.Null(container.LastChild);
-            Assert.Null(paragraph.Parent);
-        }
-
-        [Test]
-        public void CanBeInsertedInto()
-        {
-            ContainerBlock container = new MockContainerBlock();
-
-            var one = new ParagraphBlock();
-            container.Insert(0, one);
-            Assert.AreEqual(1, container.Count);
-            Assert.AreSame(container[0], one);
-            Assert.AreSame(container, one.Parent);
-
-            var two = new ParagraphBlock();
-            container.Insert(1, two);
-            Assert.AreEqual(2, container.Count);
-            Assert.AreSame(container[0], one);
-            Assert.AreSame(container[1], two);
-            Assert.AreSame(container, two.Parent);
-
-            var three = new ParagraphBlock();
-            container.Insert(0, three);
-            Assert.AreEqual(3, container.Count);
-            Assert.AreSame(container[0], three);
-            Assert.AreSame(container[1], one);
-            Assert.AreSame(container[2], two);
-            Assert.AreSame(container, three.Parent);
-
-            Assert.Throws<ArgumentNullException>(() => container.Insert(0, null));
-            Assert.Throws<ArgumentOutOfRangeException>(() => container.Insert(4, new ParagraphBlock()));
-            Assert.Throws<ArgumentOutOfRangeException>(() => container.Insert(-1, new ParagraphBlock()));
-            Assert.Throws<ArgumentException>(() => container.Insert(0, one)); // one already has a parent
-        }
-
-        [Test]
-        public void CanBeSet()
-        {
-            ContainerBlock container = new MockContainerBlock();
-
-            var one = new ParagraphBlock();
-            container.Insert(0, one);
-            Assert.AreEqual(1, container.Count);
-            Assert.AreSame(container[0], one);
-            Assert.AreSame(container, one.Parent);
-
-            var two = new ParagraphBlock();
-            container[0] = two;
-            Assert.AreSame(container, two.Parent);
-            Assert.Null(one.Parent);
-
-            Assert.Throws<ArgumentException>(() => container[0] = two); // two already has a parent
-        }
-
-        [Test]
-        public void Contains()
-        {
-            var container = new MockContainerBlock();
-            var block = new ParagraphBlock();
-
-            Assert.False(container.Contains(block));
-
-            container.Add(block);
-            Assert.True(container.Contains(block));
-
-            container.Add(new ParagraphBlock());
-            Assert.True(container.Contains(block));
-
-            container.Insert(0, new ParagraphBlock());
-            Assert.True(container.Contains(block));
-        }
-
-        [Test]
-        public void Remove()
-        {
-            var container = new MockContainerBlock();
-            var block = new ParagraphBlock();
-
-            Assert.False(container.Remove(block));
-            Assert.AreEqual(0, container.Count);
-            Assert.Throws<ArgumentOutOfRangeException>(() => container.RemoveAt(0));
-            Assert.AreEqual(0, container.Count);
-
-            container.Add(block);
-            Assert.AreEqual(1, container.Count);
-            Assert.True(container.Remove(block));
-            Assert.AreEqual(0, container.Count);
-            Assert.False(container.Remove(block));
-            Assert.AreEqual(0, container.Count);
-
-            container.Add(block);
-            Assert.AreEqual(1, container.Count);
-            container.RemoveAt(0);
-            Assert.AreEqual(0, container.Count);
-            Assert.Throws<ArgumentOutOfRangeException>(() => container.RemoveAt(0));
-            Assert.AreEqual(0, container.Count);
-
-            container.Add(new ParagraphBlock { Column = 1 });
-            container.Add(new ParagraphBlock { Column = 2 });
-            container.Add(new ParagraphBlock { Column = 3 });
-            container.Add(new ParagraphBlock { Column = 4 });
-            Assert.AreEqual(4, container.Count);
-
-            container.RemoveAt(2);
-            Assert.AreEqual(3, container.Count);
-            Assert.AreEqual(4, container[2].Column);
-
-            Assert.True(container.Remove(container[1]));
-            Assert.AreEqual(2, container.Count);
-            Assert.AreEqual(1, container[0].Column);
-            Assert.AreEqual(4, container[1].Column);
-            Assert.Throws<IndexOutOfRangeException>(() => _ = container[2]);
-        }
-
-        [Test]
-        public void CopyTo()
-        {
-            var container = new MockContainerBlock();
-
-            var destination = new Block[4];
-            container.CopyTo(destination, 0);
-            container.CopyTo(destination, 1);
-            container.CopyTo(destination, -1);
-            container.CopyTo(destination, 5);
-            Assert.Null(destination[0]);
-
-            container.Add(new ParagraphBlock());
-            container.CopyTo(destination, 0);
-            Assert.NotNull(destination[0]);
-            Assert.Null(destination[1]);
-            Assert.Null(destination[2]);
-            Assert.Null(destination[3]);
-
-            container.CopyTo(destination, 2);
-            Assert.NotNull(destination[0]);
-            Assert.Null(destination[1]);
-            Assert.NotNull(destination[2]);
-            Assert.Null(destination[3]);
-
-            Array.Clear(destination);
-
-            container.Add(new ParagraphBlock());
-            container.CopyTo(destination, 1);
-            Assert.Null(destination[0]);
-            Assert.NotNull(destination[1]);
-            Assert.NotNull(destination[2]);
-            Assert.Null(destination[3]);
-
-            Assert.Throws<IndexOutOfRangeException>(() => container.CopyTo(destination, 3));
         }
     }
+
+    [Test]
+    public void CanBeCleared()
+    {
+        ContainerBlock container = new MockContainerBlock();
+        Assert.AreEqual(0, container.Count);
+        Assert.Null(container.LastChild);
+
+        var paragraph = new ParagraphBlock();
+        Assert.Null(paragraph.Parent);
+
+        container.Add(paragraph);
+
+        Assert.AreEqual(1, container.Count);
+        Assert.AreSame(container, paragraph.Parent);
+        Assert.AreSame(paragraph, container.LastChild);
+
+        container.Clear();
+
+        Assert.AreEqual(0, container.Count);
+        Assert.Null(container.LastChild);
+        Assert.Null(paragraph.Parent);
+    }
+
+    [Test]
+    public void CanBeInsertedInto()
+    {
+        ContainerBlock container = new MockContainerBlock();
+
+        var one = new ParagraphBlock();
+        container.Insert(0, one);
+        Assert.AreEqual(1, container.Count);
+        Assert.AreSame(container[0], one);
+        Assert.AreSame(container, one.Parent);
+
+        var two = new ParagraphBlock();
+        container.Insert(1, two);
+        Assert.AreEqual(2, container.Count);
+        Assert.AreSame(container[0], one);
+        Assert.AreSame(container[1], two);
+        Assert.AreSame(container, two.Parent);
+
+        var three = new ParagraphBlock();
+        container.Insert(0, three);
+        Assert.AreEqual(3, container.Count);
+        Assert.AreSame(container[0], three);
+        Assert.AreSame(container[1], one);
+        Assert.AreSame(container[2], two);
+        Assert.AreSame(container, three.Parent);
+
+        Assert.Throws<ArgumentNullException>(() => container.Insert(0, null));
+        Assert.Throws<ArgumentOutOfRangeException>(() => container.Insert(4, new ParagraphBlock()));
+        Assert.Throws<ArgumentOutOfRangeException>(() => container.Insert(-1, new ParagraphBlock()));
+        Assert.Throws<ArgumentException>(() => container.Insert(0, one)); // one already has a parent
+    }
+
+    [Test]
+    public void CanBeSet()
+    {
+        ContainerBlock container = new MockContainerBlock();
+
+        var one = new ParagraphBlock();
+        container.Insert(0, one);
+        Assert.AreEqual(1, container.Count);
+        Assert.AreSame(container[0], one);
+        Assert.AreSame(container, one.Parent);
+
+        var two = new ParagraphBlock();
+        container[0] = two;
+        Assert.AreSame(container, two.Parent);
+        Assert.Null(one.Parent);
+
+        Assert.Throws<ArgumentException>(() => container[0] = two); // two already has a parent
+    }
+
+    [Test]
+    public void Contains()
+    {
+        var container = new MockContainerBlock();
+        var block = new ParagraphBlock();
+
+        Assert.False(container.Contains(block));
+
+        container.Add(block);
+        Assert.True(container.Contains(block));
+
+        container.Add(new ParagraphBlock());
+        Assert.True(container.Contains(block));
+
+        container.Insert(0, new ParagraphBlock());
+        Assert.True(container.Contains(block));
+    }
+
+    [Test]
+    public void Remove()
+    {
+        var container = new MockContainerBlock();
+        var block = new ParagraphBlock();
+
+        Assert.False(container.Remove(block));
+        Assert.AreEqual(0, container.Count);
+        Assert.Throws<ArgumentOutOfRangeException>(() => container.RemoveAt(0));
+        Assert.AreEqual(0, container.Count);
+
+        container.Add(block);
+        Assert.AreEqual(1, container.Count);
+        Assert.True(container.Remove(block));
+        Assert.AreEqual(0, container.Count);
+        Assert.False(container.Remove(block));
+        Assert.AreEqual(0, container.Count);
+
+        container.Add(block);
+        Assert.AreEqual(1, container.Count);
+        container.RemoveAt(0);
+        Assert.AreEqual(0, container.Count);
+        Assert.Throws<ArgumentOutOfRangeException>(() => container.RemoveAt(0));
+        Assert.AreEqual(0, container.Count);
+
+        container.Add(new ParagraphBlock { Column = 1 });
+        container.Add(new ParagraphBlock { Column = 2 });
+        container.Add(new ParagraphBlock { Column = 3 });
+        container.Add(new ParagraphBlock { Column = 4 });
+        Assert.AreEqual(4, container.Count);
+
+        container.RemoveAt(2);
+        Assert.AreEqual(3, container.Count);
+        Assert.AreEqual(4, container[2].Column);
+
+        Assert.True(container.Remove(container[1]));
+        Assert.AreEqual(2, container.Count);
+        Assert.AreEqual(1, container[0].Column);
+        Assert.AreEqual(4, container[1].Column);
+        Assert.Throws<IndexOutOfRangeException>(() => _ = container[2]);
+    }
+
+    [Test]
+    public void CopyTo()
+    {
+        var container = new MockContainerBlock();
+
+        var destination = new Block[4];
+        container.CopyTo(destination, 0);
+        container.CopyTo(destination, 1);
+        container.CopyTo(destination, -1);
+        container.CopyTo(destination, 5);
+        Assert.Null(destination[0]);
+
+        container.Add(new ParagraphBlock());
+        container.CopyTo(destination, 0);
+        Assert.NotNull(destination[0]);
+        Assert.Null(destination[1]);
+        Assert.Null(destination[2]);
+        Assert.Null(destination[3]);
+
+        container.CopyTo(destination, 2);
+        Assert.NotNull(destination[0]);
+        Assert.Null(destination[1]);
+        Assert.NotNull(destination[2]);
+        Assert.Null(destination[3]);
+
+        Array.Clear(destination);
+
+        container.Add(new ParagraphBlock());
+        container.CopyTo(destination, 1);
+        Assert.Null(destination[0]);
+        Assert.NotNull(destination[1]);
+        Assert.NotNull(destination[2]);
+        Assert.Null(destination[3]);
+
+        Assert.Throws<IndexOutOfRangeException>(() => container.CopyTo(destination, 3));
+    }
 }

src/Markdig.Tests/TestContainerInlines.cs

@@ -1,41 +1,38 @@
-using System;
 using Markdig.Syntax;
 using Markdig.Syntax.Inlines;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestContainerInlines
 {
-    public class TestContainerInlines
+    private class MockLeafBlock : LeafBlock
     {
-        private class MockLeafBlock : LeafBlock
+        public MockLeafBlock()
+            : base(null)
         {
-            public MockLeafBlock()
-                : base(null)
-            {
 
-            }
-        }
-
-        [Test]
-        public void CanBeAddedToLeafBlock()
-        {
-            var leafBlock1 = new MockLeafBlock();
-
-            var one = new ContainerInline();
-            Assert.Null(one.ParentBlock);
-
-            leafBlock1.Inline = one;
-            Assert.AreSame(leafBlock1, one.ParentBlock);
-
-            var two = new ContainerInline();
-            Assert.Null(two.ParentBlock);
-
-            leafBlock1.Inline = two;
-            Assert.AreSame(leafBlock1, two.ParentBlock);
-            Assert.Null(one.ParentBlock);
-
-            var leafBlock2 = new MockLeafBlock();
-            Assert.Throws<ArgumentException>(() => leafBlock2.Inline = two);
         }
     }
+
+    [Test]
+    public void CanBeAddedToLeafBlock()
+    {
+        var leafBlock1 = new MockLeafBlock();
+
+        var one = new ContainerInline();
+        Assert.Null(one.ParentBlock);
+
+        leafBlock1.Inline = one;
+        Assert.AreSame(leafBlock1, one.ParentBlock);
+
+        var two = new ContainerInline();
+        Assert.Null(two.ParentBlock);
+
+        leafBlock1.Inline = two;
+        Assert.AreSame(leafBlock1, two.ParentBlock);
+        Assert.Null(one.ParentBlock);
+
+        var leafBlock2 = new MockLeafBlock();
+        Assert.Throws<ArgumentException>(() => leafBlock2.Inline = two);
+    }
 }

src/Markdig.Tests/TestCustomEmojis.cs

@@ -1,128 +1,124 @@
-using System;
-using System.Collections.Generic;
 using Markdig.Extensions.Emoji;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestCustomEmojis
 {
-    [TestFixture]
-    public class TestCustomEmojis
+    [Test]
+    [TestCase(":smiley:", "<p>♥</p>\n")]
+    [TestCase(":confused:", "<p>:confused:</p>\n")] // default emoji does not work
+    [TestCase(":/", "<p>:/</p>\n")] // default smiley does not work
+    public void TestCustomEmoji(string input, string expected)
     {
-        [Test]
-        [TestCase(":smiley:", "<p>♥</p>\n")]
-        [TestCase(":confused:", "<p>:confused:</p>\n")] // default emoji does not work
-        [TestCase(":/", "<p>:/</p>\n")] // default smiley does not work
-        public void TestCustomEmoji(string input, string expected)
-        {
-            var emojiToUnicode = new Dictionary<string, string>();
-            var smileyToEmoji = new Dictionary<string, string>();
+        var emojiToUnicode = new Dictionary<string, string>();
+        var smileyToEmoji = new Dictionary<string, string>();
 
-            emojiToUnicode[":smiley:"] = "♥";
+        emojiToUnicode[":smiley:"] = "♥";
 
-            var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
+        var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
 
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseEmojiAndSmiley(customEmojiMapping: customMapping)
-                .Build();
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseEmojiAndSmiley(customEmojiMapping: customMapping)
+            .Build();
 
-            var actual = Markdown.ToHtml(input, pipeline);
-            Assert.AreEqual(expected, actual);
-        }
+        var actual = Markdown.ToHtml(input, pipeline);
+        Assert.AreEqual(expected, actual);
+    }
 
-        [Test]
-        [TestCase(":testheart:", "<p>♥</p>\n")]
-        [TestCase("hello", "<p>♥</p>\n")]
-        [TestCase(":confused:", "<p>:confused:</p>\n")] // default emoji does not work
-        [TestCase(":/", "<p>:/</p>\n")] // default smiley does not work
-        public void TestCustomSmiley(string input, string expected)
-        {
-            var emojiToUnicode = new Dictionary<string, string>();
-            var smileyToEmoji = new Dictionary<string, string>();
+    [Test]
+    [TestCase(":testheart:", "<p>♥</p>\n")]
+    [TestCase("hello", "<p>♥</p>\n")]
+    [TestCase(":confused:", "<p>:confused:</p>\n")] // default emoji does not work
+    [TestCase(":/", "<p>:/</p>\n")] // default smiley does not work
+    public void TestCustomSmiley(string input, string expected)
+    {
+        var emojiToUnicode = new Dictionary<string, string>();
+        var smileyToEmoji = new Dictionary<string, string>();
 
-            emojiToUnicode[":testheart:"] = "♥";
-            smileyToEmoji["hello"] = ":testheart:";
+        emojiToUnicode[":testheart:"] = "♥";
+        smileyToEmoji["hello"] = ":testheart:";
 
-            var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
+        var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
 
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseEmojiAndSmiley(customEmojiMapping: customMapping)
-                .Build();
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseEmojiAndSmiley(customEmojiMapping: customMapping)
+            .Build();
 
-            var actual = Markdown.ToHtml(input, pipeline);
-            Assert.AreEqual(expected, actual);
-        }
+        var actual = Markdown.ToHtml(input, pipeline);
+        Assert.AreEqual(expected, actual);
+    }
 
-        [Test]
-        [TestCase(":smiley:", "<p>♥</p>\n")]
-        [TestCase(":)", "<p>♥</p>\n")]
-        [TestCase(":confused:", "<p>😕</p>\n")] // default emoji still works
-        [TestCase(":/", "<p>😕</p>\n")] // default smiley still works
-        public void TestOverrideDefaultWithCustomEmoji(string input, string expected)
-        {
-            var emojiToUnicode = EmojiMapping.GetDefaultEmojiShortcodeToUnicode();
-            var smileyToEmoji = EmojiMapping.GetDefaultSmileyToEmojiShortcode();
+    [Test]
+    [TestCase(":smiley:", "<p>♥</p>\n")]
+    [TestCase(":)", "<p>♥</p>\n")]
+    [TestCase(":confused:", "<p>😕</p>\n")] // default emoji still works
+    [TestCase(":/", "<p>😕</p>\n")] // default smiley still works
+    public void TestOverrideDefaultWithCustomEmoji(string input, string expected)
+    {
+        var emojiToUnicode = EmojiMapping.GetDefaultEmojiShortcodeToUnicode();
+        var smileyToEmoji = EmojiMapping.GetDefaultSmileyToEmojiShortcode();
 
-            emojiToUnicode[":smiley:"] = "♥";
+        emojiToUnicode[":smiley:"] = "♥";
 
-            var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
+        var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
 
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseEmojiAndSmiley(customEmojiMapping: customMapping)
-                .Build();
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseEmojiAndSmiley(customEmojiMapping: customMapping)
+            .Build();
 
-            var actual = Markdown.ToHtml(input, pipeline);
-            Assert.AreEqual(expected, actual);
-        }
+        var actual = Markdown.ToHtml(input, pipeline);
+        Assert.AreEqual(expected, actual);
+    }
 
-        [Test]
-        [TestCase(":testheart:", "<p>♥</p>\n")]
-        [TestCase("hello", "<p>♥</p>\n")]
-        [TestCase(":confused:", "<p>😕</p>\n")] // default emoji still works
-        [TestCase(":/", "<p>😕</p>\n")] // default smiley still works
-        public void TestOverrideDefaultWithCustomSmiley(string input, string expected)
-        {
-            var emojiToUnicode = EmojiMapping.GetDefaultEmojiShortcodeToUnicode();
-            var smileyToEmoji = EmojiMapping.GetDefaultSmileyToEmojiShortcode();
+    [Test]
+    [TestCase(":testheart:", "<p>♥</p>\n")]
+    [TestCase("hello", "<p>♥</p>\n")]
+    [TestCase(":confused:", "<p>😕</p>\n")] // default emoji still works
+    [TestCase(":/", "<p>😕</p>\n")] // default smiley still works
+    public void TestOverrideDefaultWithCustomSmiley(string input, string expected)
+    {
+        var emojiToUnicode = EmojiMapping.GetDefaultEmojiShortcodeToUnicode();
+        var smileyToEmoji = EmojiMapping.GetDefaultSmileyToEmojiShortcode();
 
-            emojiToUnicode[":testheart:"] = "♥";
-            smileyToEmoji["hello"] = ":testheart:";
+        emojiToUnicode[":testheart:"] = "♥";
+        smileyToEmoji["hello"] = ":testheart:";
 
-            var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
+        var customMapping = new EmojiMapping(emojiToUnicode, smileyToEmoji);
 
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseEmojiAndSmiley(customEmojiMapping: customMapping)
-                .Build();
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseEmojiAndSmiley(customEmojiMapping: customMapping)
+            .Build();
 
-            var actual = Markdown.ToHtml(input, pipeline);
-            Assert.AreEqual(expected, actual);
-        }
+        var actual = Markdown.ToHtml(input, pipeline);
+        Assert.AreEqual(expected, actual);
+    }
 
-        [Test]
-        public void TestCustomEmojiValidation()
-        {
-            var emojiToUnicode = new Dictionary<string, string>();
-            var smileyToEmoji = new Dictionary<string, string>();
+    [Test]
+    public void TestCustomEmojiValidation()
+    {
+        var emojiToUnicode = new Dictionary<string, string>();
+        var smileyToEmoji = new Dictionary<string, string>();
 
-            Assert.Throws<ArgumentNullException>(() => new EmojiMapping(null, smileyToEmoji));
-            Assert.Throws<ArgumentNullException>(() => new EmojiMapping(emojiToUnicode, null));
+        Assert.Throws<ArgumentNullException>(() => new EmojiMapping(null, smileyToEmoji));
+        Assert.Throws<ArgumentNullException>(() => new EmojiMapping(emojiToUnicode, null));
 
-            emojiToUnicode.Add("null-value", null);
-            Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
-            emojiToUnicode.Clear();
+        emojiToUnicode.Add("null-value", null);
+        Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
+        emojiToUnicode.Clear();
 
-            smileyToEmoji.Add("null-value", null);
-            Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
-            smileyToEmoji.Clear();
+        smileyToEmoji.Add("null-value", null);
+        Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
+        smileyToEmoji.Clear();
 
-            smileyToEmoji.Add("foo", "something-that-does-not-exist-in-emojiToUnicode");
-            Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
-            smileyToEmoji.Clear();
+        smileyToEmoji.Add("foo", "something-that-does-not-exist-in-emojiToUnicode");
+        Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
+        smileyToEmoji.Clear();
 
-            emojiToUnicode.Add("a", "aaa");
-            emojiToUnicode.Add("b", "bbb");
-            emojiToUnicode.Add("c", "ccc");
-            smileyToEmoji.Add("a", "c"); // "a" already exists in emojiToUnicode
-            Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
-        }
+        emojiToUnicode.Add("a", "aaa");
+        emojiToUnicode.Add("b", "bbb");
+        emojiToUnicode.Add("c", "ccc");
+        smileyToEmoji.Add("a", "c"); // "a" already exists in emojiToUnicode
+        Assert.Throws<ArgumentException>(() => new EmojiMapping(emojiToUnicode, smileyToEmoji));
     }
 }

src/Markdig.Tests/TestDescendantsOrder.cs

@@ -1,150 +1,145 @@
-using NUnit.Framework;
-using Markdig.Helpers;
 using Markdig.Syntax;
 using Markdig.Syntax.Inlines;
-using System.Linq;
-using System.Collections.Generic;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestDescendantsOrder
 {
-    [TestFixture]
-    public class TestDescendantsOrder
+    public static void TestSchemas(MarkdownDocument[] specsSyntaxTrees)
     {
-        public static void TestSchemas(MarkdownDocument[] specsSyntaxTrees)
+        foreach (var syntaxTree in specsSyntaxTrees)
         {
-            foreach (var syntaxTree in specsSyntaxTrees)
+            AssertIEnumerablesAreEqual(
+                Descendants_Legacy(syntaxTree),
+                syntaxTree.Descendants());
+
+            AssertIEnumerablesAreEqual(
+                syntaxTree.Descendants().OfType<ParagraphBlock>(),
+                syntaxTree.Descendants<ParagraphBlock>());
+
+            AssertIEnumerablesAreEqual(
+                syntaxTree.Descendants().OfType<ParagraphBlock>(),
+                (syntaxTree as ContainerBlock).Descendants<ParagraphBlock>());
+
+            AssertIEnumerablesAreEqual(
+                syntaxTree.Descendants().OfType<LiteralInline>(),
+                syntaxTree.Descendants<LiteralInline>());
+
+            foreach (LiteralInline literalInline in syntaxTree.Descendants<LiteralInline>())
+            {
+                Assert.AreSame(Array.Empty<ListBlock>(), literalInline.Descendants<ListBlock>());
+                Assert.AreSame(Array.Empty<ParagraphBlock>(), literalInline.Descendants<ParagraphBlock>());
+                Assert.AreSame(Array.Empty<ContainerInline>(), literalInline.Descendants<ContainerInline>());
+            }
+
+            foreach (ContainerInline containerInline in syntaxTree.Descendants<ContainerInline>())
             {
                 AssertIEnumerablesAreEqual(
-                    Descendants_Legacy(syntaxTree),
-                    syntaxTree.Descendants());
+                    containerInline.FindDescendants<LiteralInline>(),
+                    containerInline.Descendants<LiteralInline>());
 
                 AssertIEnumerablesAreEqual(
-                    syntaxTree.Descendants().OfType<ParagraphBlock>(),
-                    syntaxTree.Descendants<ParagraphBlock>());
+                    containerInline.FindDescendants<LiteralInline>(),
+                    (containerInline as MarkdownObject).Descendants<LiteralInline>());
 
-                AssertIEnumerablesAreEqual(
-                    syntaxTree.Descendants().OfType<ParagraphBlock>(),
-                    (syntaxTree as ContainerBlock).Descendants<ParagraphBlock>());
-
-                AssertIEnumerablesAreEqual(
-                    syntaxTree.Descendants().OfType<LiteralInline>(),
-                    syntaxTree.Descendants<LiteralInline>());
-
-                foreach (LiteralInline literalInline in syntaxTree.Descendants<LiteralInline>())
+                if (containerInline.FirstChild is null)
                 {
-                    Assert.AreSame(ArrayHelper.Empty<ListBlock>(), literalInline.Descendants<ListBlock>());
-                    Assert.AreSame(ArrayHelper.Empty<ParagraphBlock>(), literalInline.Descendants<ParagraphBlock>());
-                    Assert.AreSame(ArrayHelper.Empty<ContainerInline>(), literalInline.Descendants<ContainerInline>());
+                    Assert.AreSame(Array.Empty<LiteralInline>(), containerInline.Descendants<LiteralInline>());
+                    Assert.AreSame(Array.Empty<LiteralInline>(), containerInline.FindDescendants<LiteralInline>());
+                    Assert.AreSame(Array.Empty<LiteralInline>(), (containerInline as MarkdownObject).Descendants<LiteralInline>());
                 }
 
-                foreach (ContainerInline containerInline in syntaxTree.Descendants<ContainerInline>())
+                Assert.AreSame(Array.Empty<ListBlock>(), containerInline.Descendants<ListBlock>());
+                Assert.AreSame(Array.Empty<ParagraphBlock>(), containerInline.Descendants<ParagraphBlock>());
+            }
+
+            foreach (ParagraphBlock paragraphBlock in syntaxTree.Descendants<ParagraphBlock>())
+            {
+                AssertIEnumerablesAreEqual(
+                    (paragraphBlock as MarkdownObject).Descendants<LiteralInline>(),
+                    paragraphBlock.Descendants<LiteralInline>());
+
+                Assert.AreSame(Array.Empty<ParagraphBlock>(), paragraphBlock.Descendants<ParagraphBlock>());
+            }
+
+            foreach (ContainerBlock containerBlock in syntaxTree.Descendants<ContainerBlock>())
+            {
+                AssertIEnumerablesAreEqual(
+                    containerBlock.Descendants<LiteralInline>(),
+                    (containerBlock as MarkdownObject).Descendants<LiteralInline>());
+
+                AssertIEnumerablesAreEqual(
+                    containerBlock.Descendants<ParagraphBlock>(),
+                    (containerBlock as MarkdownObject).Descendants<ParagraphBlock>());
+
+                if (containerBlock.Count == 0)
                 {
-                    AssertIEnumerablesAreEqual(
-                        containerInline.FindDescendants<LiteralInline>(),
-                        containerInline.Descendants<LiteralInline>());
+                    Assert.AreSame(Array.Empty<LiteralInline>(), containerBlock.Descendants<LiteralInline>());
+                    Assert.AreSame(Array.Empty<LiteralInline>(), (containerBlock as Block).Descendants<LiteralInline>());
+                    Assert.AreSame(Array.Empty<LiteralInline>(), (containerBlock as MarkdownObject).Descendants<LiteralInline>());
+                }
+            }
+        }
+    }
 
-                    AssertIEnumerablesAreEqual(
-                        containerInline.FindDescendants<LiteralInline>(),
-                        (containerInline as MarkdownObject).Descendants<LiteralInline>());
+    private static void AssertIEnumerablesAreEqual<T>(IEnumerable<T> first, IEnumerable<T> second)
+    {
+        var firstList = new List<T>(first);
+        var secondList = new List<T>(second);
 
-                    if (containerInline.FirstChild is null)
+        Assert.AreEqual(firstList.Count, secondList.Count);
+
+        for (int i = 0; i < firstList.Count; i++)
+        {
+            Assert.AreSame(firstList[i], secondList[i]);
+        }
+    }
+
+    private static IEnumerable<MarkdownObject> Descendants_Legacy(MarkdownObject markdownObject)
+    {
+        // TODO: implement a recursiveless method
+
+        var block = markdownObject as ContainerBlock;
+        if (block != null)
+        {
+            foreach (var subBlock in block)
+            {
+                yield return subBlock;
+
+                foreach (var sub in Descendants_Legacy(subBlock))
+                {
+                    yield return sub;
+                }
+
+                // Visit leaf block that have inlines
+                var leafBlock = subBlock as LeafBlock;
+                if (leafBlock?.Inline != null)
+                {
+                    foreach (var subInline in Descendants_Legacy(leafBlock.Inline))
                     {
-                        Assert.AreSame(ArrayHelper.Empty<LiteralInline>(), containerInline.Descendants<LiteralInline>());
-                        Assert.AreSame(ArrayHelper.Empty<LiteralInline>(), containerInline.FindDescendants<LiteralInline>());
-                        Assert.AreSame(ArrayHelper.Empty<LiteralInline>(), (containerInline as MarkdownObject).Descendants<LiteralInline>());
-                    }
-
-                    Assert.AreSame(ArrayHelper.Empty<ListBlock>(), containerInline.Descendants<ListBlock>());
-                    Assert.AreSame(ArrayHelper.Empty<ParagraphBlock>(), containerInline.Descendants<ParagraphBlock>());
-                }
-
-                foreach (ParagraphBlock paragraphBlock in syntaxTree.Descendants<ParagraphBlock>())
-                {
-                    AssertIEnumerablesAreEqual(
-                        (paragraphBlock as MarkdownObject).Descendants<LiteralInline>(),
-                        paragraphBlock.Descendants<LiteralInline>());
-
-                    Assert.AreSame(ArrayHelper.Empty<ParagraphBlock>(), paragraphBlock.Descendants<ParagraphBlock>());
-                }
-
-                foreach (ContainerBlock containerBlock in syntaxTree.Descendants<ContainerBlock>())
-                {
-                    AssertIEnumerablesAreEqual(
-                        containerBlock.Descendants<LiteralInline>(),
-                        (containerBlock as MarkdownObject).Descendants<LiteralInline>());
-
-                    AssertIEnumerablesAreEqual(
-                        containerBlock.Descendants<ParagraphBlock>(),
-                        (containerBlock as MarkdownObject).Descendants<ParagraphBlock>());
-
-                    if (containerBlock.Count == 0)
-                    {
-                        Assert.AreSame(ArrayHelper.Empty<LiteralInline>(), containerBlock.Descendants<LiteralInline>());
-                        Assert.AreSame(ArrayHelper.Empty<LiteralInline>(), (containerBlock as Block).Descendants<LiteralInline>());
-                        Assert.AreSame(ArrayHelper.Empty<LiteralInline>(), (containerBlock as MarkdownObject).Descendants<LiteralInline>());
+                        yield return subInline;
                     }
                 }
             }
         }
-
-        private static void AssertIEnumerablesAreEqual<T>(IEnumerable<T> first, IEnumerable<T> second)
+        else
         {
-            var firstList = new List<T>(first);
-            var secondList = new List<T>(second);
-
-            Assert.AreEqual(firstList.Count, secondList.Count);
-
-            for (int i = 0; i < firstList.Count; i++)
+            var inline = markdownObject as ContainerInline;
+            if (inline != null)
             {
-                Assert.AreSame(firstList[i], secondList[i]);
-            }
-        }
-
-        private static IEnumerable<MarkdownObject> Descendants_Legacy(MarkdownObject markdownObject)
-        {
-            // TODO: implement a recursiveless method
-
-            var block = markdownObject as ContainerBlock;
-            if (block != null)
-            {
-                foreach (var subBlock in block)
+                var child = inline.FirstChild;
+                while (child != null)
                 {
-                    yield return subBlock;
+                    var next = child.NextSibling;
+                    yield return child;
 
-                    foreach (var sub in Descendants_Legacy(subBlock))
+                    foreach (var sub in Descendants_Legacy(child))
                     {
                         yield return sub;
                     }
 
-                    // Visit leaf block that have inlines
-                    var leafBlock = subBlock as LeafBlock;
-                    if (leafBlock?.Inline != null)
-                    {
-                        foreach (var subInline in Descendants_Legacy(leafBlock.Inline))
-                        {
-                            yield return subInline;
-                        }
-                    }
-                }
-            }
-            else
-            {
-                var inline = markdownObject as ContainerInline;
-                if (inline != null)
-                {
-                    var child = inline.FirstChild;
-                    while (child != null)
-                    {
-                        var next = child.NextSibling;
-                        yield return child;
-
-                        foreach (var sub in Descendants_Legacy(child))
-                        {
-                            yield return sub;
-                        }
-
-                        child = next;
-                    }
+                    child = next;
                 }
             }
         }

src/Markdig.Tests/TestEmphasisExtended.cs

@@ -1,169 +1,166 @@
+using System.Diagnostics;
+
 using Markdig.Parsers.Inlines;
 using Markdig.Renderers;
 using Markdig.Renderers.Html;
 using Markdig.Syntax.Inlines;
-using NUnit.Framework;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Linq;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestEmphasisExtended
 {
-    [TestFixture]
-    public class TestEmphasisExtended
+    class EmphasisTestExtension : IMarkdownExtension
     {
-        class EmphasisTestExtension : IMarkdownExtension
+        public void Setup(MarkdownPipelineBuilder pipeline)
         {
-            public void Setup(MarkdownPipelineBuilder pipeline)
+            var emphasisParser = pipeline.InlineParsers.Find<EmphasisInlineParser>();
+            Debug.Assert(emphasisParser != null);
+
+            foreach (var emphasis in EmphasisTestDescriptors)
             {
-                var emphasisParser = pipeline.InlineParsers.Find<EmphasisInlineParser>();
-                Debug.Assert(emphasisParser != null);
-
-                foreach (var emphasis in EmphasisTestDescriptors)
-                {
-                    emphasisParser.EmphasisDescriptors.Add(
-                        new EmphasisDescriptor(emphasis.Character, emphasis.Minimum, emphasis.Maximum, true));
-                }
-                emphasisParser.TryCreateEmphasisInlineList.Add((delimiterChar, delimiterCount) =>
-                {
-                    return delimiterChar == '*' || delimiterChar == '_'
-                        ? null
-                        : new CustomEmphasisInline() { DelimiterChar = delimiterChar, DelimiterCount = delimiterCount };
-                });
+                emphasisParser.EmphasisDescriptors.Add(
+                    new EmphasisDescriptor(emphasis.Character, emphasis.Minimum, emphasis.Maximum, true));
             }
-
-            public void Setup(MarkdownPipeline pipeline, IMarkdownRenderer renderer)
+            emphasisParser.TryCreateEmphasisInlineList.Add((delimiterChar, delimiterCount) =>
             {
-                renderer.ObjectRenderers.Insert(0, new EmphasisRenderer());
-            }
-
-            class EmphasisRenderer : HtmlObjectRenderer<CustomEmphasisInline>
-            {
-                protected override void Write(HtmlRenderer renderer, CustomEmphasisInline obj)
-                {
-                    var tag = EmphasisTestDescriptors.First(test => test.Character == obj.DelimiterChar).Tags[obj.DelimiterCount];
-
-                    renderer.Write(tag.OpeningTag);
-                    renderer.WriteChildren(obj);
-                    renderer.Write(tag.ClosingTag);
-                }
-            }
+                return delimiterChar is '*' or '_'
+                    ? null
+                    : new CustomEmphasisInline() { DelimiterChar = delimiterChar, DelimiterCount = delimiterCount };
+            });
         }
-        class Tag
+
+        public void Setup(MarkdownPipeline pipeline, IMarkdownRenderer renderer)
         {
-#pragma warning disable CS0649
-            public int Level;
-#pragma warning restore CS0649
-            public string RawTag;
-            public string OpeningTag;
-            public string ClosingTag;
-
-            public Tag(string tag)
-            {
-                RawTag = tag;
-                OpeningTag = "<" + tag + ">";
-                ClosingTag = "</" + tag + ">";
-            }
-
-            public static implicit operator Tag(string tag)
-                => new Tag(tag);
+            renderer.ObjectRenderers.Insert(0, new EmphasisRenderer());
         }
-        class EmphasisTestDescriptor
-        {
-            public char Character;
-            public int Minimum;
-            public int Maximum;
-            public Dictionary<int, Tag> Tags = new Dictionary<int, Tag>();
 
-            private EmphasisTestDescriptor(char character, int min, int max)
+        class EmphasisRenderer : HtmlObjectRenderer<CustomEmphasisInline>
+        {
+            protected override void Write(HtmlRenderer renderer, CustomEmphasisInline obj)
             {
-                Character = character;
-                Minimum = min;
-                Maximum = max;
-            }
-            public EmphasisTestDescriptor(char character, int min, int max, params Tag[] tags)
-                : this(character, min, max)
-            {
-                Debug.Assert(tags.Length == max - min + 1);
-                foreach (var tag in tags)
-                {
-                    Tags.Add(min++, tag);
-                }
-            }
-            public EmphasisTestDescriptor(char character, int min, int max, string tag)
-                : this(character, min, max, new Tag(tag)) { }
-        }
-        class CustomEmphasisInline : EmphasisInline { }
-        static readonly EmphasisTestDescriptor[] EmphasisTestDescriptors = new[]
-        {
-            //                            Min Max
-            new EmphasisTestDescriptor('"', 1, 1, "quotation"),
-            new EmphasisTestDescriptor(',', 1, 2, "comma", "extra-comma"),
-            new EmphasisTestDescriptor('!', 2, 3, "warning", "error"),
-            new EmphasisTestDescriptor('=', 1, 3, "equal", "really-equal", "congruent"),
-            new EmphasisTestDescriptor('1', 1, 1, "one-only"),
-            new EmphasisTestDescriptor('2', 2, 2, "two-only"),
-            new EmphasisTestDescriptor('3', 3, 3, "three-only"),
-        };
+                var tag = EmphasisTestDescriptors.First(test => test.Character == obj.DelimiterChar).Tags[obj.DelimiterCount];
 
-        static readonly MarkdownPipeline Pipeline = new MarkdownPipelineBuilder().Use<EmphasisTestExtension>().Build();
-
-        [Test]
-        [TestCase("*foo**",         "<em>foo</em>*")]
-        [TestCase("**foo*",         "*<em>foo</em>")]
-        [TestCase("***foo***",      "<em><strong>foo</strong></em>")]
-        [TestCase("**_foo_**",      "<strong><em>foo</em></strong>")]
-        [TestCase("_**foo**_",      "<em><strong>foo</strong></em>")]
-        [TestCase("\"foo\"",        "<quotation>foo</quotation>")]
-        [TestCase("\"\"foo\"\"",    "<quotation><quotation>foo</quotation></quotation>")]
-        [TestCase("\"foo\"\"",      "<quotation>foo</quotation>&quot;")]
-        [TestCase("\"\"foo\"",      "&quot;<quotation>foo</quotation>")]
-        [TestCase(", foo",          ", foo")]
-        [TestCase(", foo,",         ", foo,")]
-        [TestCase(",some, foo,",    "<comma>some</comma> foo,")]
-        [TestCase(",,foo,,",        "<extra-comma>foo</extra-comma>")]
-        [TestCase(",foo,,",         "<comma>foo</comma>,")]
-        [TestCase(",,,foo,,,",      "<comma><extra-comma>foo</extra-comma></comma>")]
-        [TestCase("*foo*&_foo_",     "<em>foo</em>&amp;<em>foo</em>")]
-        [TestCase("!1!",            "!1!")]
-        [TestCase("!!2!!",          "<warning>2</warning>")]
-        [TestCase("!!!3!!!",        "<error>3</error>")]
-        [TestCase("!!!34!!!!",      "<error>34</error>!")]
-        [TestCase("!!!!43!!!",      "!<error>43</error>")]
-        [TestCase("!!!!44!!!!",     "!<error>44!</error>")] // This is a new case - should the second ! be before or after </error>?
-        [TestCase("!!!!!5!!!!!",    "<warning><error>5</error></warning>")]
-        [TestCase("!!!!!!6!!!!!!",  "<error><error>6</error></error>")]
-        [TestCase("!! !mixed!!!",   "!! !mixed!!!")] // can't open the delimiter because of the whitespace
-        [TestCase("=",              "=")]
-        [TestCase("==",             "==")]
-        [TestCase("====",           "====")]
-        [TestCase("=a",             "=a")]
-        [TestCase("=a=",            "<equal>a</equal>")]
-        [TestCase("==a=",           "=<equal>a</equal>")]
-        [TestCase("==a==",          "<really-equal>a</really-equal>")]
-        [TestCase("==a===",         "<really-equal>a</really-equal>=")]
-        [TestCase("===a===",        "<congruent>a</congruent>")]
-        [TestCase("====a====",      "<equal><congruent>a</congruent></equal>")]
-        [TestCase("=====a=====",    "<really-equal><congruent>a</congruent></really-equal>")]
-        [TestCase("1",              "1")]
-        [TestCase("1 1",            "1 1")]
-        [TestCase("1Foo1",          "<one-only>Foo</one-only>")]
-        [TestCase("1121",           "1<one-only>2</one-only>")]
-        [TestCase("22322",          "<two-only>3</two-only>")]
-        [TestCase("2232",           "2232")]
-        [TestCase("333",            "333")]
-        [TestCase("3334333",        "<three-only>4</three-only>")]
-        [TestCase("33334333",       "3<three-only>4</three-only>")]
-        [TestCase("33343333",       "<three-only>4</three-only>3")]
-        [TestCase("122122",         "<one-only>22</one-only>22")]
-        [TestCase("221221",         "<two-only>1</two-only>1")]
-        [TestCase("122foo221",      "<one-only><two-only>foo</two-only></one-only>")]
-        [TestCase("122foo122",      "<one-only>22foo</one-only>22")]
-        [TestCase("!!!!!Attention:!! \"==1+1== 2\",but ===333 and 222===, mod 111!!!",
-            "<error><warning>Attention:</warning> <quotation><really-equal><one-only>+</one-only></really-equal> 2</quotation><comma>but <congruent>333 and 222</congruent></comma> mod 111</error>")]
-        public void TestEmphasis(string markdown, string expectedHtml)
-        {
-            TestParser.TestSpec(markdown, "<p>" + expectedHtml + "</p>", Pipeline);
+                renderer.Write(tag.OpeningTag);
+                renderer.WriteChildren(obj);
+                renderer.Write(tag.ClosingTag);
+            }
         }
     }
+    class Tag
+    {
+#pragma warning disable CS0649
+        public int Level;
+#pragma warning restore CS0649
+        public string RawTag;
+        public string OpeningTag;
+        public string ClosingTag;
+
+        public Tag(string tag)
+        {
+            RawTag = tag;
+            OpeningTag = "<" + tag + ">";
+            ClosingTag = "</" + tag + ">";
+        }
+
+        public static implicit operator Tag(string tag)
+            => new Tag(tag);
+    }
+    class EmphasisTestDescriptor
+    {
+        public char Character;
+        public int Minimum;
+        public int Maximum;
+        public Dictionary<int, Tag> Tags = new Dictionary<int, Tag>();
+
+        private EmphasisTestDescriptor(char character, int min, int max)
+        {
+            Character = character;
+            Minimum = min;
+            Maximum = max;
+        }
+        public EmphasisTestDescriptor(char character, int min, int max, params Tag[] tags)
+            : this(character, min, max)
+        {
+            Debug.Assert(tags.Length == max - min + 1);
+            foreach (var tag in tags)
+            {
+                Tags.Add(min++, tag);
+            }
+        }
+        public EmphasisTestDescriptor(char character, int min, int max, string tag)
+            : this(character, min, max, new Tag(tag)) { }
+    }
+    class CustomEmphasisInline : EmphasisInline { }
+    static readonly EmphasisTestDescriptor[] EmphasisTestDescriptors = new[]
+    {
+        //                            Min Max
+        new EmphasisTestDescriptor('"', 1, 1, "quotation"),
+        new EmphasisTestDescriptor(',', 1, 2, "comma", "extra-comma"),
+        new EmphasisTestDescriptor('!', 2, 3, "warning", "error"),
+        new EmphasisTestDescriptor('=', 1, 3, "equal", "really-equal", "congruent"),
+        new EmphasisTestDescriptor('1', 1, 1, "one-only"),
+        new EmphasisTestDescriptor('2', 2, 2, "two-only"),
+        new EmphasisTestDescriptor('3', 3, 3, "three-only"),
+    };
+
+    static readonly MarkdownPipeline Pipeline = new MarkdownPipelineBuilder().Use<EmphasisTestExtension>().Build();
+
+    [Test]
+    [TestCase("*foo**",         "<em>foo</em>*")]
+    [TestCase("**foo*",         "*<em>foo</em>")]
+    [TestCase("***foo***",      "<em><strong>foo</strong></em>")]
+    [TestCase("**_foo_**",      "<strong><em>foo</em></strong>")]
+    [TestCase("_**foo**_",      "<em><strong>foo</strong></em>")]
+    [TestCase("\"foo\"",        "<quotation>foo</quotation>")]
+    [TestCase("\"\"foo\"\"",    "<quotation><quotation>foo</quotation></quotation>")]
+    [TestCase("\"foo\"\"",      "<quotation>foo</quotation>&quot;")]
+    [TestCase("\"\"foo\"",      "&quot;<quotation>foo</quotation>")]
+    [TestCase(", foo",          ", foo")]
+    [TestCase(", foo,",         ", foo,")]
+    [TestCase(",some, foo,",    "<comma>some</comma> foo,")]
+    [TestCase(",,foo,,",        "<extra-comma>foo</extra-comma>")]
+    [TestCase(",foo,,",         "<comma>foo</comma>,")]
+    [TestCase(",,,foo,,,",      "<comma><extra-comma>foo</extra-comma></comma>")]
+    [TestCase("*foo*&_foo_",     "<em>foo</em>&amp;<em>foo</em>")]
+    [TestCase("!1!",            "!1!")]
+    [TestCase("!!2!!",          "<warning>2</warning>")]
+    [TestCase("!!!3!!!",        "<error>3</error>")]
+    [TestCase("!!!34!!!!",      "<error>34</error>!")]
+    [TestCase("!!!!43!!!",      "!<error>43</error>")]
+    [TestCase("!!!!44!!!!",     "!<error>44!</error>")] // This is a new case - should the second ! be before or after </error>?
+    [TestCase("!!!!!5!!!!!",    "<warning><error>5</error></warning>")]
+    [TestCase("!!!!!!6!!!!!!",  "<error><error>6</error></error>")]
+    [TestCase("!! !mixed!!!",   "!! !mixed!!!")] // can't open the delimiter because of the whitespace
+    [TestCase("=",              "=")]
+    [TestCase("==",             "==")]
+    [TestCase("====",           "====")]
+    [TestCase("=a",             "=a")]
+    [TestCase("=a=",            "<equal>a</equal>")]
+    [TestCase("==a=",           "=<equal>a</equal>")]
+    [TestCase("==a==",          "<really-equal>a</really-equal>")]
+    [TestCase("==a===",         "<really-equal>a</really-equal>=")]
+    [TestCase("===a===",        "<congruent>a</congruent>")]
+    [TestCase("====a====",      "<equal><congruent>a</congruent></equal>")]
+    [TestCase("=====a=====",    "<really-equal><congruent>a</congruent></really-equal>")]
+    [TestCase("1",              "1")]
+    [TestCase("1 1",            "1 1")]
+    [TestCase("1Foo1",          "<one-only>Foo</one-only>")]
+    [TestCase("1121",           "1<one-only>2</one-only>")]
+    [TestCase("22322",          "<two-only>3</two-only>")]
+    [TestCase("2232",           "2232")]
+    [TestCase("333",            "333")]
+    [TestCase("3334333",        "<three-only>4</three-only>")]
+    [TestCase("33334333",       "3<three-only>4</three-only>")]
+    [TestCase("33343333",       "<three-only>4</three-only>3")]
+    [TestCase("122122",         "<one-only>22</one-only>22")]
+    [TestCase("221221",         "<two-only>1</two-only>1")]
+    [TestCase("122foo221",      "<one-only><two-only>foo</two-only></one-only>")]
+    [TestCase("122foo122",      "<one-only>22foo</one-only>22")]
+    [TestCase("!!!!!Attention:!! \"==1+1== 2\",but ===333 and 222===, mod 111!!!",
+        "<error><warning>Attention:</warning> <quotation><really-equal><one-only>+</one-only></really-equal> 2</quotation><comma>but <congruent>333 and 222</congruent></comma> mod 111</error>")]
+    public void TestEmphasis(string markdown, string expectedHtml)
+    {
+        TestParser.TestSpec(markdown, "<p>" + expectedHtml + "</p>", Pipeline);
+    }
 }

src/Markdig.Tests/TestEmphasisExtraOptions.cs

@@ -1,45 +1,43 @@
-using NUnit.Framework;
 using Markdig.Extensions.EmphasisExtras;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestEmphasisExtraOptions
 {
-    [TestFixture]
-    public class TestEmphasisExtraOptions
+    [Test]
+    public void OnlyStrikethrough_Single()
     {
-        [Test]
-        public void OnlyStrikethrough_Single()
-        {
-            TestParser.TestSpec("~foo~", "<p>~foo~</p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Strikethrough).Build());
-        }
+        TestParser.TestSpec("~foo~", "<p>~foo~</p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Strikethrough).Build());
+    }
 
-        [Test]
-        public void OnlyStrikethrough_Double()
-        {
-            TestParser.TestSpec("~~foo~~", "<p><del>foo</del></p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Strikethrough).Build());
-        }
+    [Test]
+    public void OnlyStrikethrough_Double()
+    {
+        TestParser.TestSpec("~~foo~~", "<p><del>foo</del></p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Strikethrough).Build());
+    }
 
-        [Test]
-        public void OnlySubscript_Single()
-        {
-            TestParser.TestSpec("~foo~", "<p><sub>foo</sub></p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Subscript).Build());
-        }
+    [Test]
+    public void OnlySubscript_Single()
+    {
+        TestParser.TestSpec("~foo~", "<p><sub>foo</sub></p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Subscript).Build());
+    }
 
-        [Test]
-        public void OnlySubscript_Double()
-        {
-            TestParser.TestSpec("~~foo~~", "<p><sub><sub>foo</sub></sub></p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Subscript).Build());
-        }
+    [Test]
+    public void OnlySubscript_Double()
+    {
+        TestParser.TestSpec("~~foo~~", "<p><sub><sub>foo</sub></sub></p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Subscript).Build());
+    }
 
-        [Test]
-        public void SubscriptAndStrikethrough_Single()
-        {
-            TestParser.TestSpec("~foo~", "<p><sub>foo</sub></p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Strikethrough | EmphasisExtraOptions.Subscript).Build());
-        }
+    [Test]
+    public void SubscriptAndStrikethrough_Single()
+    {
+        TestParser.TestSpec("~foo~", "<p><sub>foo</sub></p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Strikethrough | EmphasisExtraOptions.Subscript).Build());
+    }
 
-        [Test]
-        public void SubscriptAndStrikethrough_Double()
-        {
-            TestParser.TestSpec("~~foo~~", "<p><del>foo</del></p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Strikethrough | EmphasisExtraOptions.Subscript).Build());
-        }
+    [Test]
+    public void SubscriptAndStrikethrough_Double()
+    {
+        TestParser.TestSpec("~~foo~~", "<p><del>foo</del></p>", new MarkdownPipelineBuilder().UseEmphasisExtras(EmphasisExtraOptions.Strikethrough | EmphasisExtraOptions.Subscript).Build());
     }
 }

src/Markdig.Tests/TestEmphasisPlus.cs

@@ -1,23 +1,37 @@
 // Copyright (c) Alexandre Mutel. All rights reserved.
-// This file is licensed under the BSD-Clause 2 license. 
+// This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
-using NUnit.Framework;
 
-namespace Markdig.Tests
+using Markdig.Syntax;
+using Markdig.Syntax.Inlines;
+
+namespace Markdig.Tests;
+
+[TestFixture]
+public partial class TestEmphasisPlus
 {
-    [TestFixture]
-    public partial class TestEmphasisPlus
+    [Test]
+    public void StrongNormal()
     {
-        [Test]
-        public void StrongNormal()
-        {
-            TestParser.TestSpec("***Strong emphasis*** normal", "<p><em><strong>Strong emphasis</strong></em> normal</p>", "");
-        }
+        TestParser.TestSpec("***Strong emphasis*** normal", "<p><em><strong>Strong emphasis</strong></em> normal</p>", "");
+    }
 
-        [Test]
-        public void NormalStrongNormal()
-        {
-            TestParser.TestSpec("normal ***Strong emphasis*** normal", "<p>normal <em><strong>Strong emphasis</strong></em> normal</p>", "");
-        }
+    [Test]
+    public void NormalStrongNormal()
+    {
+        TestParser.TestSpec("normal ***Strong emphasis*** normal", "<p>normal <em><strong>Strong emphasis</strong></em> normal</p>", "");
+    }
+
+    [Test]
+    public void OpenEmphasisHasConvenientContentStringSlice()
+    {
+        var pipeline = new MarkdownPipelineBuilder().Build();
+
+        var document = Markdown.Parse("test*test", pipeline);
+
+        var emphasisDelimiterLiteral = (LiteralInline)((ParagraphBlock)document.LastChild).Inline.ElementAt(1);
+        Assert.That(emphasisDelimiterLiteral.Content.Text == "test*test");
+        Assert.That(emphasisDelimiterLiteral.Content.Start == 4);
+        Assert.That(emphasisDelimiterLiteral.Content.End == 4);
     }
 }

src/Markdig.Tests/TestExceptionNotThrown.cs

@@ -1,48 +1,45 @@
-using NUnit.Framework;
+namespace Markdig.Tests;
 
-namespace Markdig.Tests
+[TestFixture]
+public class TestExceptionNotThrown
 {
-    [TestFixture]
-    public class TestExceptionNotThrown
+    [Test]
+    public void DoesNotThrowIndexOutOfRangeException1()
     {
-        [Test]
-        public void DoesNotThrowIndexOutOfRangeException1()
+        Assert.DoesNotThrow(() =>
         {
-            Assert.DoesNotThrow(() =>
-            {
-                var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
-                Markdown.ToHtml("+-\n|\n+", pipeline);
-            });
-        }
+            var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
+            Markdown.ToHtml("+-\n|\n+", pipeline);
+        });
+    }
 
-        [Test]
-        public void DoesNotThrowIndexOutOfRangeException2()
+    [Test]
+    public void DoesNotThrowIndexOutOfRangeException2()
+    {
+        Assert.DoesNotThrow(() =>
         {
-            Assert.DoesNotThrow(() =>
-            {
-                var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
-                Markdown.ToHtml("+--\n|\n+0", pipeline);
-            });
-        }
+            var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
+            Markdown.ToHtml("+--\n|\n+0", pipeline);
+        });
+    }
 
-        [Test]
-        public void DoesNotThrowIndexOutOfRangeException3()
+    [Test]
+    public void DoesNotThrowIndexOutOfRangeException3()
+    {
+        Assert.DoesNotThrow(() =>
         {
-            Assert.DoesNotThrow(() =>
-            {
-                var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
-                Markdown.ToHtml("+-\n|\n+\n0", pipeline);
-            });
-        }
+            var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
+            Markdown.ToHtml("+-\n|\n+\n0", pipeline);
+        });
+    }
 
-        [Test]
-        public void DoesNotThrowIndexOutOfRangeException4()
+    [Test]
+    public void DoesNotThrowIndexOutOfRangeException4()
+    {
+        Assert.DoesNotThrow(() =>
         {
-            Assert.DoesNotThrow(() =>
-            {
-                var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
-                Markdown.ToHtml("+-\n|\n+0", pipeline);
-            });
-        }
+            var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
+            Markdown.ToHtml("+-\n|\n+0", pipeline);
+        });
     }
 }

src/Markdig.Tests/TestFastStringWriter.cs

@@ -1,189 +1,186 @@
-using Markdig.Helpers;
-using NUnit.Framework;
-using System;
 using System.Text;
-using System.Threading.Tasks;
 
-namespace Markdig.Tests
+using Markdig.Helpers;
+
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestFastStringWriter
 {
-    [TestFixture]
-    public class TestFastStringWriter
+    private const string NewLineReplacement = "~~NEW_LINE~~";
+
+    private FastStringWriter _writer = new();
+
+    [SetUp]
+    public void Setup()
     {
-        private const string NewLineReplacement = "~~NEW_LINE~~";
-
-        private FastStringWriter _writer = new();
-
-        [SetUp]
-        public void Setup()
+        _writer = new FastStringWriter
         {
-            _writer = new FastStringWriter
-            {
-                NewLine = NewLineReplacement
-            };
-        }
+            NewLine = NewLineReplacement
+        };
+    }
 
-        public void AssertToString(string value)
-        {
-            value = value.Replace("\n", NewLineReplacement);
-            Assert.AreEqual(value, _writer.ToString());
-            Assert.AreEqual(value, _writer.ToString());
-        }
+    public void AssertToString(string value)
+    {
+        value = value.Replace("\n", NewLineReplacement);
+        Assert.AreEqual(value, _writer.ToString());
+        Assert.AreEqual(value, _writer.ToString());
+    }
 
-        [Test]
-        public async Task NewLine()
-        {
-            Assert.AreEqual("\n", new FastStringWriter().NewLine);
+    [Test]
+    public async Task NewLine()
+    {
+        Assert.AreEqual("\n", new FastStringWriter().NewLine);
 
-            _writer.NewLine = "\r";
-            Assert.AreEqual("\r", _writer.NewLine);
+        _writer.NewLine = "\r";
+        Assert.AreEqual("\r", _writer.NewLine);
 
-            _writer.NewLine = "foo";
-            Assert.AreEqual("foo", _writer.NewLine);
+        _writer.NewLine = "foo";
+        Assert.AreEqual("foo", _writer.NewLine);
 
-            _writer.WriteLine();
-            await _writer.WriteLineAsync();
-            _writer.WriteLine("bar");
-            Assert.AreEqual("foofoobarfoo", _writer.ToString());
-        }
+        _writer.WriteLine();
+        await _writer.WriteLineAsync();
+        _writer.WriteLine("bar");
+        Assert.AreEqual("foofoobarfoo", _writer.ToString());
+    }
 
-        [Test]
-        public async Task FlushCloseDispose()
+    [Test]
+    public async Task FlushCloseDispose()
+    {
+        _writer.Write('a');
+
+        // Nops
+        _writer.Close();
+        _writer.Dispose();
+        await _writer.DisposeAsync();
+        _writer.Flush();
+        await _writer.FlushAsync();
+
+        _writer.Write('b');
+        AssertToString("ab");
+    }
+
+    [Test]
+    public async Task Write_Char()
+    {
+        _writer.Write('a');
+        AssertToString("a");
+
+        _writer.Write('b');
+        AssertToString("ab");
+
+        _writer.Write('\0');
+        _writer.Write('\r');
+        _writer.Write('\u1234');
+        AssertToString("ab\0\r\u1234");
+
+        _writer.Reset();
+        AssertToString("");
+
+        _writer.Write('a');
+        _writer.WriteLine('b');
+        _writer.Write('c');
+        _writer.Write('d');
+        _writer.WriteLine('e');
+        AssertToString("ab\ncde\n");
+
+        await _writer.WriteAsync('f');
+        await _writer.WriteLineAsync('g');
+        AssertToString("ab\ncde\nfg\n");
+
+        _writer.Reset();
+
+        for (int i = 0; i < 2050; i++)
         {
             _writer.Write('a');
-
-            // Nops
-            _writer.Close();
-            _writer.Dispose();
-            await _writer.DisposeAsync();
-            _writer.Flush();
-            await _writer.FlushAsync();
-
-            _writer.Write('b');
-            AssertToString("ab");
-        }
-
-        [Test]
-        public async Task Write_Char()
-        {
-            _writer.Write('a');
-            AssertToString("a");
-
-            _writer.Write('b');
-            AssertToString("ab");
-
-            _writer.Write('\0');
-            _writer.Write('\r');
-            _writer.Write('\u1234');
-            AssertToString("ab\0\r\u1234");
-
-            _writer.Reset();
-            AssertToString("");
-
-            _writer.Write('a');
-            _writer.WriteLine('b');
-            _writer.Write('c');
-            _writer.Write('d');
-            _writer.WriteLine('e');
-            AssertToString("ab\ncde\n");
-
-            await _writer.WriteAsync('f');
-            await _writer.WriteLineAsync('g');
-            AssertToString("ab\ncde\nfg\n");
-
-            _writer.Reset();
-
-            for (int i = 0; i < 2050; i++)
-            {
-                _writer.Write('a');
-                AssertToString(new string('a', i + 1));
-            }
-        }
-
-        [Test]
-        public async Task Write_String()
-        {
-            _writer.Write("foo");
-            AssertToString("foo");
-
-            _writer.WriteLine("bar");
-            AssertToString("foobar\n");
-
-            await _writer.WriteAsync("baz");
-            await _writer.WriteLineAsync("foo");
-            AssertToString("foobar\nbazfoo\n");
-
-            _writer.Write(new string('a', 1050));
-            AssertToString("foobar\nbazfoo\n" + new string('a', 1050));
-        }
-
-        [Test]
-        public async Task Write_Span()
-        {
-            _writer.Write("foo".AsSpan());
-            AssertToString("foo");
-
-            _writer.WriteLine("bar".AsSpan());
-            AssertToString("foobar\n");
-
-            await _writer.WriteAsync("baz".AsMemory());
-            await _writer.WriteLineAsync("foo".AsMemory());
-            AssertToString("foobar\nbazfoo\n");
-
-            _writer.Write(new string('a', 1050).AsSpan());
-            AssertToString("foobar\nbazfoo\n" + new string('a', 1050));
-        }
-
-        [Test]
-        public async Task Write_CharArray()
-        {
-            _writer.Write("foo".ToCharArray());
-            AssertToString("foo");
-
-            _writer.WriteLine("bar".ToCharArray());
-            AssertToString("foobar\n");
-
-            await _writer.WriteAsync("baz".ToCharArray());
-            await _writer.WriteLineAsync("foo".ToCharArray());
-            AssertToString("foobar\nbazfoo\n");
-
-            _writer.Write(new string('a', 1050).ToCharArray());
-            AssertToString("foobar\nbazfoo\n" + new string('a', 1050));
-        }
-
-        [Test]
-        public async Task Write_CharArrayWithIndexes()
-        {
-            _writer.Write("foo".ToCharArray(), 1, 1);
-            AssertToString("o");
-
-            _writer.WriteLine("bar".ToCharArray(), 0, 2);
-            AssertToString("oba\n");
-
-            await _writer.WriteAsync("baz".ToCharArray(), 0, 1);
-            await _writer.WriteLineAsync("foo".ToCharArray(), 0, 3);
-            AssertToString("oba\nbfoo\n");
-
-            _writer.Write(new string('a', 1050).ToCharArray(), 10, 1035);
-            AssertToString("oba\nbfoo\n" + new string('a', 1035));
-        }
-
-        [Test]
-        public async Task Write_StringBuilder()
-        {
-            _writer.Write(new StringBuilder("foo"));
-            AssertToString("foo");
-
-            _writer.WriteLine(new StringBuilder("bar"));
-            AssertToString("foobar\n");
-
-            await _writer.WriteAsync(new StringBuilder("baz"));
-            await _writer.WriteLineAsync(new StringBuilder("foo"));
-            AssertToString("foobar\nbazfoo\n");
-
-            var sb = new StringBuilder("foo");
-            sb.Append('a', 1050);
-            _writer.Write(sb);
-            AssertToString("foobar\nbazfoo\nfoo" + new string('a', 1050));
+            AssertToString(new string('a', i + 1));
         }
     }
+
+    [Test]
+    public async Task Write_String()
+    {
+        _writer.Write("foo");
+        AssertToString("foo");
+
+        _writer.WriteLine("bar");
+        AssertToString("foobar\n");
+
+        await _writer.WriteAsync("baz");
+        await _writer.WriteLineAsync("foo");
+        AssertToString("foobar\nbazfoo\n");
+
+        _writer.Write(new string('a', 1050));
+        AssertToString("foobar\nbazfoo\n" + new string('a', 1050));
+    }
+
+    [Test]
+    public async Task Write_Span()
+    {
+        _writer.Write("foo".AsSpan());
+        AssertToString("foo");
+
+        _writer.WriteLine("bar".AsSpan());
+        AssertToString("foobar\n");
+
+        await _writer.WriteAsync("baz".AsMemory());
+        await _writer.WriteLineAsync("foo".AsMemory());
+        AssertToString("foobar\nbazfoo\n");
+
+        _writer.Write(new string('a', 1050).AsSpan());
+        AssertToString("foobar\nbazfoo\n" + new string('a', 1050));
+    }
+
+    [Test]
+    public async Task Write_CharArray()
+    {
+        _writer.Write("foo".ToCharArray());
+        AssertToString("foo");
+
+        _writer.WriteLine("bar".ToCharArray());
+        AssertToString("foobar\n");
+
+        await _writer.WriteAsync("baz".ToCharArray());
+        await _writer.WriteLineAsync("foo".ToCharArray());
+        AssertToString("foobar\nbazfoo\n");
+
+        _writer.Write(new string('a', 1050).ToCharArray());
+        AssertToString("foobar\nbazfoo\n" + new string('a', 1050));
+    }
+
+    [Test]
+    public async Task Write_CharArrayWithIndexes()
+    {
+        _writer.Write("foo".ToCharArray(), 1, 1);
+        AssertToString("o");
+
+        _writer.WriteLine("bar".ToCharArray(), 0, 2);
+        AssertToString("oba\n");
+
+        await _writer.WriteAsync("baz".ToCharArray(), 0, 1);
+        await _writer.WriteLineAsync("foo".ToCharArray(), 0, 3);
+        AssertToString("oba\nbfoo\n");
+
+        _writer.Write(new string('a', 1050).ToCharArray(), 10, 1035);
+        AssertToString("oba\nbfoo\n" + new string('a', 1035));
+    }
+
+    [Test]
+    public async Task Write_StringBuilder()
+    {
+        _writer.Write(new StringBuilder("foo"));
+        AssertToString("foo");
+
+        _writer.WriteLine(new StringBuilder("bar"));
+        AssertToString("foobar\n");
+
+        await _writer.WriteAsync(new StringBuilder("baz"));
+        await _writer.WriteLineAsync(new StringBuilder("foo"));
+        AssertToString("foobar\nbazfoo\n");
+
+        var sb = new StringBuilder("foo");
+        sb.Append('a', 1050);
+        _writer.Write(sb);
+        AssertToString("foobar\nbazfoo\nfoo" + new string('a', 1050));
+    }
 }

src/Markdig.Tests/TestFencedCodeBlocks.cs

@@ -1,46 +1,43 @@
-using System.Linq;
 using Markdig.Syntax;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestFencedCodeBlocks
 {
-    public class TestFencedCodeBlocks
+    [Test]
+    [TestCase("c#", "c#", "")]
+    [TestCase("C#", "C#", "")]
+    [TestCase(" c#", "c#", "")]
+    [TestCase(" c# ", "c#", "")]
+    [TestCase(" \tc# ", "c#", "")]
+    [TestCase("\t c# \t", "c#", "")]
+    [TestCase(" c# ", "c#", "")]
+    [TestCase(" c# foo", "c#", "foo")]
+    [TestCase(" c# \t  fOo \t", "c#", "fOo")]
+    [TestCase("in\\%fo arg\\%ument", "in%fo", "arg%ument")]
+    [TestCase("info	 arg´ument", "info\t", "arg\u00B4ument")]
+    public void TestInfoAndArguments(string infoString, string expectedInfo, string expectedArguments)
     {
-        [Test]
-        [TestCase("c#", "c#", "")]
-        [TestCase("C#", "C#", "")]
-        [TestCase(" c#", "c#", "")]
-        [TestCase(" c# ", "c#", "")]
-        [TestCase(" \tc# ", "c#", "")]
-        [TestCase("\t c# \t", "c#", "")]
-        [TestCase(" c# ", "c#", "")]
-        [TestCase(" c# foo", "c#", "foo")]
-        [TestCase(" c# \t  fOo \t", "c#", "fOo")]
-        [TestCase("in\\%fo arg\\%ument", "in%fo", "arg%ument")]
-        [TestCase("info	 arg´ument", "info\t", "arg\u00B4ument")]
-        public void TestInfoAndArguments(string infoString, string expectedInfo, string expectedArguments)
+        Test('`');
+        Test('~');
+
+        void Test(char fencedChar)
         {
-            Test('`');
-            Test('~');
+            const string Contents = "Foo\nBar\n";
 
-            void Test(char fencedChar)
-            {
-                const string Contents = "Foo\nBar\n";
+            var fence = new string(fencedChar, 3);
+            string markdownText = $"{fence}{infoString}\n{Contents}\n{fence}\n";
 
-                string fence = new string(fencedChar, 3);
-                string markdownText = $"{fence}{infoString}\n{Contents}\n{fence}\n";
+            MarkdownDocument document = Markdown.Parse(markdownText);
 
-                MarkdownDocument document = Markdown.Parse(markdownText);
+            FencedCodeBlock codeBlock = document.Descendants<FencedCodeBlock>().Single();
 
-                FencedCodeBlock codeBlock = document.Descendants<FencedCodeBlock>().Single();
-
-                Assert.AreEqual(fencedChar, codeBlock.FencedChar);
-                Assert.AreEqual(3, codeBlock.OpeningFencedCharCount);
-                Assert.AreEqual(3, codeBlock.ClosingFencedCharCount);
-                Assert.AreEqual(expectedInfo, codeBlock.Info);
-                Assert.AreEqual(expectedArguments, codeBlock.Arguments);
-                Assert.AreEqual(Contents, codeBlock.Lines.ToString());
-            }
+            Assert.AreEqual(fencedChar, codeBlock.FencedChar);
+            Assert.AreEqual(3, codeBlock.OpeningFencedCharCount);
+            Assert.AreEqual(3, codeBlock.ClosingFencedCharCount);
+            Assert.AreEqual(expectedInfo, codeBlock.Info);
+            Assert.AreEqual(expectedArguments, codeBlock.Arguments);
+            Assert.AreEqual(Contents, codeBlock.Lines.ToString());
         }
     }
 }

src/Markdig.Tests/TestHtmlAttributes.cs

@@ -3,94 +3,91 @@
 // See the license.txt file in the project root for more information.
 
 using Markdig.Renderers.Html;
-using NUnit.Framework;
-using System.Collections.Generic;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture()]
+public class TestHtmlAttributes
 {
-    [TestFixture()]
-    public class TestHtmlAttributes
+    [Test]
+    public void TestAddClass()
     {
-        [Test]
-        public void TestAddClass()
-        {
-            var attributes = new HtmlAttributes();
-            attributes.AddClass("test");
-            Assert.NotNull(attributes.Classes);
-            Assert.AreEqual(new List<string>() { "test" }, attributes.Classes);
+        var attributes = new HtmlAttributes();
+        attributes.AddClass("test");
+        Assert.NotNull(attributes.Classes);
+        Assert.AreEqual(new List<string>() { "test" }, attributes.Classes);
 
-            attributes.AddClass("test");
-            Assert.AreEqual(1, attributes.Classes.Count);
+        attributes.AddClass("test");
+        Assert.AreEqual(1, attributes.Classes.Count);
 
-            attributes.AddClass("test1");
-            Assert.AreEqual(new List<string>() { "test", "test1" }, attributes.Classes);
-        }
+        attributes.AddClass("test1");
+        Assert.AreEqual(new List<string>() { "test", "test1" }, attributes.Classes);
+    }
 
-        [Test]
-        public void TestAddProperty()
-        {
-            var attributes = new HtmlAttributes();
-            attributes.AddProperty("key1", "1");
-            Assert.NotNull(attributes.Properties);
-            Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1") }, attributes.Properties);
+    [Test]
+    public void TestAddProperty()
+    {
+        var attributes = new HtmlAttributes();
+        attributes.AddProperty("key1", "1");
+        Assert.NotNull(attributes.Properties);
+        Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1") }, attributes.Properties);
 
-            attributes.AddPropertyIfNotExist("key1", "1");
-            Assert.NotNull(attributes.Properties);
-            Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1") }, attributes.Properties);
+        attributes.AddPropertyIfNotExist("key1", "1");
+        Assert.NotNull(attributes.Properties);
+        Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1") }, attributes.Properties);
 
-            attributes.AddPropertyIfNotExist("key2", "2");
-            Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1"), new KeyValuePair<string, string>("key2", "2") }, attributes.Properties);
-        }
+        attributes.AddPropertyIfNotExist("key2", "2");
+        Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1"), new KeyValuePair<string, string>("key2", "2") }, attributes.Properties);
+    }
 
-        [Test]
-        public void TestCopyTo()
-        {
-            var from = new HtmlAttributes();
-            from.AddClass("test");
-            from.AddProperty("key1", "1");
+    [Test]
+    public void TestCopyTo()
+    {
+        var from = new HtmlAttributes();
+        from.AddClass("test");
+        from.AddProperty("key1", "1");
 
-            var to = new HtmlAttributes();
-            from.CopyTo(to);
+        var to = new HtmlAttributes();
+        from.CopyTo(to);
 
-            Assert.True(ReferenceEquals(from.Classes, to.Classes));
-            Assert.True(ReferenceEquals(from.Properties, to.Properties));
+        Assert.True(ReferenceEquals(from.Classes, to.Classes));
+        Assert.True(ReferenceEquals(from.Properties, to.Properties));
 
-            //          From: Classes      From: Properties     To: Classes     To: Properties
-            // test1:        null                null              null             null
-            from = new HtmlAttributes();
-            to = new HtmlAttributes();
-            from.CopyTo(to, false, false);
-            Assert.Null(to.Classes);
-            Assert.Null(to.Properties);
+        //          From: Classes      From: Properties     To: Classes     To: Properties
+        // test1:        null                null              null             null
+        from = new HtmlAttributes();
+        to = new HtmlAttributes();
+        from.CopyTo(to, false, false);
+        Assert.Null(to.Classes);
+        Assert.Null(to.Properties);
 
-            // test2:      ["test"]            ["key1", "1"]       null             null
-            from = new HtmlAttributes();
-            to = new HtmlAttributes();
-            from.AddClass("test");
-            from.AddProperty("key1", "1");
-            from.CopyTo(to, false, false);
-            Assert.AreEqual(new List<string>() { "test" }, to.Classes);
-            Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1")}, to.Properties);
+        // test2:      ["test"]            ["key1", "1"]       null             null
+        from = new HtmlAttributes();
+        to = new HtmlAttributes();
+        from.AddClass("test");
+        from.AddProperty("key1", "1");
+        from.CopyTo(to, false, false);
+        Assert.AreEqual(new List<string>() { "test" }, to.Classes);
+        Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1")}, to.Properties);
 
-            // test3:        null                null            ["test"]       ["key1", "1"]       
-            from = new HtmlAttributes();
-            to = new HtmlAttributes();
-            to.AddClass("test");
-            to.AddProperty("key1", "1");
-            from.CopyTo(to, false, false);
-            Assert.AreEqual(new List<string>() { "test" }, to.Classes);
-            Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1") }, to.Properties);
+        // test3:        null                null            ["test"]       ["key1", "1"]       
+        from = new HtmlAttributes();
+        to = new HtmlAttributes();
+        to.AddClass("test");
+        to.AddProperty("key1", "1");
+        from.CopyTo(to, false, false);
+        Assert.AreEqual(new List<string>() { "test" }, to.Classes);
+        Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1") }, to.Properties);
 
-            // test4:      ["test1"]           ["key2", "2"]     ["test"]       ["key1", "1"]       
-            from = new HtmlAttributes();
-            to = new HtmlAttributes();
-            from.AddClass("test1");
-            from.AddProperty("key2", "2");
-            to.AddClass("test");
-            to.AddProperty("key1", "1");
-            from.CopyTo(to, false, false);
-            Assert.AreEqual(new List<string>() { "test", "test1" }, to.Classes);
-            Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1"), new KeyValuePair<string, string>("key2", "2") }, to.Properties);
-        }
+        // test4:      ["test1"]           ["key2", "2"]     ["test"]       ["key1", "1"]       
+        from = new HtmlAttributes();
+        to = new HtmlAttributes();
+        from.AddClass("test1");
+        from.AddProperty("key2", "2");
+        to.AddClass("test");
+        to.AddProperty("key1", "1");
+        from.CopyTo(to, false, false);
+        Assert.AreEqual(new List<string>() { "test", "test1" }, to.Classes);
+        Assert.AreEqual(new List<KeyValuePair<string, string>>() { new KeyValuePair<string, string>("key1", "1"), new KeyValuePair<string, string>("key2", "2") }, to.Properties);
     }
 }

src/Markdig.Tests/TestHtmlCodeBlocks.cs

@@ -0,0 +1,35 @@
+using Markdig.Syntax;
+
+namespace Markdig.Tests;
+
+public class TestHtmlCodeBlocks
+{
+    // Start condition: line begins with the string < or </ followed by one of the strings (case-insensitive)
+    // {list of all tags}, followed by a space, a tab, the end of the line, the string >, or the string />.
+    public static string[] KnownSimpleHtmlTags =>
+    [
+        "address", "article", "aside", "base", "basefont", "blockquote", "body", "caption", "center", "col", "colgroup", "dd", "details",
+        "dialog", "dir", "div", "dl", "dt", "fieldset", "figcaption", "figure", "footer", "form", "frame", "frameset",
+        "h1", "h2", "h3", "h4", "h5", "h6", "head", "header", "hr", "html", "iframe", "legend", "li", "link",
+        "main", "menu", "menuitem", "nav", "noframes", "ol", "optgroup", "option", "p", "param",
+        "search", "section", "summary", "table", "tbody", "td", "tfoot", "th", "thead", "title", "tr", "track", "ul",
+    ];
+
+    [Theory]
+    [TestCaseSource(nameof(KnownSimpleHtmlTags))]
+    public void TestKnownTags(string tag)
+    {
+        MarkdownDocument document = Markdown.Parse(
+            $"""
+            Hello
+             <{tag} />
+            World
+            """.ReplaceLineEndings("\n"));
+
+        HtmlBlock[] htmlBlocks = document.Descendants<HtmlBlock>().ToArray();
+
+        Assert.AreEqual(1, htmlBlocks.Length);
+        Assert.AreEqual(7, htmlBlocks[0].Span.Start);
+        Assert.AreEqual(10 + tag.Length, htmlBlocks[0].Span.Length);
+    }
+}

src/Markdig.Tests/TestHtmlHelper.cs

@@ -1,30 +1,28 @@
 // Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
-using NUnit.Framework;
 using Markdig.Helpers;
 
-namespace Markdig.Tests
-{
-    [TestFixture]
-    public class TestHtmlHelper
-    {
-        [Test]
-        public void TestParseHtmlTagSimple()
-        {
-            var inputTag = "<a>";
-            var text = new StringSlice(inputTag);
-            Assert.True(HtmlHelper.TryParseHtmlTag(ref text, out string outputTag));
-            Assert.AreEqual(inputTag, outputTag);
-        }
+namespace Markdig.Tests;
 
-        [Test]
-        public void TestParseHtmlTagSimpleWithAttribute()
-        {
-            var inputTag = "<a href='http://google.com'>";
-            var text = new StringSlice(inputTag);
-            Assert.True(HtmlHelper.TryParseHtmlTag(ref text, out string outputTag));
-            Assert.AreEqual(inputTag, outputTag);
-        }
+[TestFixture]
+public class TestHtmlHelper
+{
+    [Test]
+    public void TestParseHtmlTagSimple()
+    {
+        var inputTag = "<a>";
+        var text = new StringSlice(inputTag);
+        Assert.True(HtmlHelper.TryParseHtmlTag(ref text, out string outputTag));
+        Assert.AreEqual(inputTag, outputTag);
+    }
+
+    [Test]
+    public void TestParseHtmlTagSimpleWithAttribute()
+    {
+        var inputTag = "<a href='http://google.com'>";
+        var text = new StringSlice(inputTag);
+        Assert.True(HtmlHelper.TryParseHtmlTag(ref text, out string outputTag));
+        Assert.AreEqual(inputTag, outputTag);
     }
 }

src/Markdig.Tests/TestImageAltText.cs

@@ -1,25 +1,23 @@
-using NUnit.Framework;
 using System.Text.RegularExpressions;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestImageAltText
 {
-    [TestFixture]
-    public class TestImageAltText
+    [Test]
+    [TestCase("![](image.jpg)", "")]
+    [TestCase("![foo](image.jpg)", "foo")]
+    [TestCase("![][1]\n\n[1]: image.jpg", "")]
+    [TestCase("![bar][1]\n\n[1]: image.jpg", "bar")]
+    [TestCase("![](image.jpg 'title')", "")]
+    [TestCase("![foo](image.jpg 'title')", "foo")]
+    [TestCase("![][1]\n\n[1]: image.jpg 'title'", "")]
+    [TestCase("![bar][1]\n\n[1]: image.jpg 'title'", "bar")]
+    public void TestImageHtmlAltText(string markdown, string expectedAltText)
     {
-        [Test]
-        [TestCase("![](image.jpg)", "")]
-        [TestCase("![foo](image.jpg)", "foo")]
-        [TestCase("![][1]\n\n[1]: image.jpg", "")]
-        [TestCase("![bar][1]\n\n[1]: image.jpg", "bar")]
-        [TestCase("![](image.jpg 'title')", "")]
-        [TestCase("![foo](image.jpg 'title')", "foo")]
-        [TestCase("![][1]\n\n[1]: image.jpg 'title'", "")]
-        [TestCase("![bar][1]\n\n[1]: image.jpg 'title'", "bar")]
-        public void TestImageHtmlAltText(string markdown, string expectedAltText)
-        {
-            string html = Markdown.ToHtml(markdown);
-            string actualAltText = Regex.Match(html, "alt=\"(.*?)\"").Groups[1].Value;
-            Assert.AreEqual(expectedAltText, actualAltText);
-        }
+        string html = Markdown.ToHtml(markdown);
+        string actualAltText = Regex.Match(html, "alt=\"(.*?)\"").Groups[1].Value;
+        Assert.AreEqual(expectedAltText, actualAltText);
     }
 }

src/Markdig.Tests/TestLazySubstring.cs

@@ -1,67 +1,65 @@
 using Markdig.Helpers;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestLazySubstring
 {
-    public class TestLazySubstring
+    [Theory]
+    [TestCase("")]
+    [TestCase("a")]
+    [TestCase("foo")]
+    public void LazySubstring_ReturnsCorrectSubstring(string text)
     {
-        [Theory]
-        [TestCase("")]
-        [TestCase("a")]
-        [TestCase("foo")]
-        public void LazySubstring_ReturnsCorrectSubstring(string text)
-        {
-            var substring = new LazySubstring(text);
-            Assert.AreEqual(0, substring.Offset);
-            Assert.AreEqual(text.Length, substring.Length);
+        var substring = new LazySubstring(text);
+        Assert.AreEqual(0, substring.Offset);
+        Assert.AreEqual(text.Length, substring.Length);
 
-            Assert.AreEqual(text, substring.AsSpan().ToString());
-            Assert.AreEqual(text, substring.AsSpan().ToString());
-            Assert.AreEqual(0, substring.Offset);
-            Assert.AreEqual(text.Length, substring.Length);
+        Assert.AreEqual(text, substring.AsSpan().ToString());
+        Assert.AreEqual(text, substring.AsSpan().ToString());
+        Assert.AreEqual(0, substring.Offset);
+        Assert.AreEqual(text.Length, substring.Length);
 
-            Assert.AreSame(substring.ToString(), substring.ToString());
-            Assert.AreEqual(text, substring.ToString());
-            Assert.AreEqual(0, substring.Offset);
-            Assert.AreEqual(text.Length, substring.Length);
+        Assert.AreSame(substring.ToString(), substring.ToString());
+        Assert.AreEqual(text, substring.ToString());
+        Assert.AreEqual(0, substring.Offset);
+        Assert.AreEqual(text.Length, substring.Length);
 
-            Assert.AreEqual(text, substring.AsSpan().ToString());
-            Assert.AreEqual(text, substring.AsSpan().ToString());
-            Assert.AreEqual(0, substring.Offset);
-            Assert.AreEqual(text.Length, substring.Length);
-        }
+        Assert.AreEqual(text, substring.AsSpan().ToString());
+        Assert.AreEqual(text, substring.AsSpan().ToString());
+        Assert.AreEqual(0, substring.Offset);
+        Assert.AreEqual(text.Length, substring.Length);
+    }
 
-        [Theory]
-        [TestCase("", 0, 0)]
-        [TestCase("a", 0, 0)]
-        [TestCase("a", 1, 0)]
-        [TestCase("a", 0, 1)]
-        [TestCase("foo", 1, 0)]
-        [TestCase("foo", 1, 1)]
-        [TestCase("foo", 1, 2)]
-        [TestCase("foo", 0, 3)]
-        public void LazySubstring_ReturnsCorrectSubstring(string text, int start, int length)
-        {
-            var substring = new LazySubstring(text, start, length);
-            Assert.AreEqual(start, substring.Offset);
-            Assert.AreEqual(length, substring.Length);
+    [Theory]
+    [TestCase("", 0, 0)]
+    [TestCase("a", 0, 0)]
+    [TestCase("a", 1, 0)]
+    [TestCase("a", 0, 1)]
+    [TestCase("foo", 1, 0)]
+    [TestCase("foo", 1, 1)]
+    [TestCase("foo", 1, 2)]
+    [TestCase("foo", 0, 3)]
+    public void LazySubstring_ReturnsCorrectSubstring(string text, int start, int length)
+    {
+        var substring = new LazySubstring(text, start, length);
+        Assert.AreEqual(start, substring.Offset);
+        Assert.AreEqual(length, substring.Length);
 
-            string expectedSubstring = text.Substring(start, length);
+        string expectedSubstring = text.Substring(start, length);
 
-            Assert.AreEqual(expectedSubstring, substring.AsSpan().ToString());
-            Assert.AreEqual(expectedSubstring, substring.AsSpan().ToString());
-            Assert.AreEqual(start, substring.Offset);
-            Assert.AreEqual(length, substring.Length);
+        Assert.AreEqual(expectedSubstring, substring.AsSpan().ToString());
+        Assert.AreEqual(expectedSubstring, substring.AsSpan().ToString());
+        Assert.AreEqual(start, substring.Offset);
+        Assert.AreEqual(length, substring.Length);
 
-            Assert.AreSame(substring.ToString(), substring.ToString());
-            Assert.AreEqual(expectedSubstring, substring.ToString());
-            Assert.AreEqual(0, substring.Offset);
-            Assert.AreEqual(length, substring.Length);
+        Assert.AreSame(substring.ToString(), substring.ToString());
+        Assert.AreEqual(expectedSubstring, substring.ToString());
+        Assert.AreEqual(0, substring.Offset);
+        Assert.AreEqual(length, substring.Length);
 
-            Assert.AreEqual(expectedSubstring, substring.AsSpan().ToString());
-            Assert.AreEqual(expectedSubstring, substring.AsSpan().ToString());
-            Assert.AreEqual(0, substring.Offset);
-            Assert.AreEqual(length, substring.Length);
-        }
+        Assert.AreEqual(expectedSubstring, substring.AsSpan().ToString());
+        Assert.AreEqual(expectedSubstring, substring.AsSpan().ToString());
+        Assert.AreEqual(0, substring.Offset);
+        Assert.AreEqual(length, substring.Length);
     }
 }

src/Markdig.Tests/TestLineReader.cs

@@ -2,126 +2,124 @@
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
 
-using NUnit.Framework;
 using Markdig.Helpers;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+/// <summary>
+/// Test for <see cref="LineReader"/>.
+/// </summary>
+[TestFixture]
+public class TestLineReader
 {
-    /// <summary>
-    /// Test for <see cref="LineReader"/>.
-    /// </summary>
-    [TestFixture]
-    public class TestLineReader
+    [Test]
+    public void TestEmpty()
     {
-        [Test]
-        public void TestEmpty()
-        {
-            var lineReader = new LineReader("");
-            Assert.Null(lineReader.ReadLine().Text);
-        }
+        var lineReader = new LineReader("");
+        Assert.Null(lineReader.ReadLine().Text);
+    }
 
-        [Test]
-        public void TestLinesOnlyLf()
-        {
-            var lineReader = new LineReader("\n\n\n");
-            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
-            Assert.AreEqual(1, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
-            Assert.AreEqual(2, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
-            Assert.Null(lineReader.ReadLine().Text);
-        }
+    [Test]
+    public void TestLinesOnlyLf()
+    {
+        var lineReader = new LineReader("\n\n\n");
+        Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+        Assert.AreEqual(1, lineReader.SourcePosition);
+        Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+        Assert.AreEqual(2, lineReader.SourcePosition);
+        Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+        Assert.Null(lineReader.ReadLine().Text);
+    }
 
-        [Test]
-        public void TestLinesOnlyCr()
-        {
-            var lineReader = new LineReader("\r\r\r");
-            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
-            Assert.AreEqual(1, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
-            Assert.AreEqual(2, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
-            Assert.Null(lineReader.ReadLine().Text);
-        }
+    [Test]
+    public void TestLinesOnlyCr()
+    {
+        var lineReader = new LineReader("\r\r\r");
+        Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+        Assert.AreEqual(1, lineReader.SourcePosition);
+        Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+        Assert.AreEqual(2, lineReader.SourcePosition);
+        Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+        Assert.Null(lineReader.ReadLine().Text);
+    }
 
-        [Test]
-        public void TestLinesOnlyCrLf()
-        {
-            var lineReader = new LineReader("\r\n\r\n\r\n");
-            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
-            Assert.AreEqual(2, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
-            Assert.AreEqual(4, lineReader.SourcePosition);
-            Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
-            Assert.Null(lineReader.ReadLine().Text);
-        }
+    [Test]
+    public void TestLinesOnlyCrLf()
+    {
+        var lineReader = new LineReader("\r\n\r\n\r\n");
+        Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+        Assert.AreEqual(2, lineReader.SourcePosition);
+        Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+        Assert.AreEqual(4, lineReader.SourcePosition);
+        Assert.AreEqual(string.Empty, lineReader.ReadLine().ToString());
+        Assert.Null(lineReader.ReadLine().Text);
+    }
 
-        [Test]
-        public void TestNoEndOfLine()
-        {
-            var lineReader = new LineReader("123");
-            Assert.AreEqual("123", lineReader.ReadLine().ToString());
-            Assert.Null(lineReader.ReadLine().Text);
-        }
+    [Test]
+    public void TestNoEndOfLine()
+    {
+        var lineReader = new LineReader("123");
+        Assert.AreEqual("123", lineReader.ReadLine().ToString());
+        Assert.Null(lineReader.ReadLine().Text);
+    }
 
-        [Test]
-        public void TestLf()
-        {
-            var lineReader = new LineReader("123\n");
-            Assert.AreEqual("123", lineReader.ReadLine().ToString());
-            Assert.AreEqual(4, lineReader.SourcePosition);
-            Assert.Null(lineReader.ReadLine().Text);
-        }
+    [Test]
+    public void TestLf()
+    {
+        var lineReader = new LineReader("123\n");
+        Assert.AreEqual("123", lineReader.ReadLine().ToString());
+        Assert.AreEqual(4, lineReader.SourcePosition);
+        Assert.Null(lineReader.ReadLine().Text);
+    }
 
-        [Test]
-        public void TestLf2()
-        {
-            // When limited == true, we limit the internal buffer exactly after the first new line char '\n'
-            var lineReader = new LineReader("123\n456");
-            Assert.AreEqual("123", lineReader.ReadLine().ToString());
-            Assert.AreEqual(4, lineReader.SourcePosition);
-            Assert.AreEqual("456", lineReader.ReadLine().ToString());
-            Assert.Null(lineReader.ReadLine().Text);
-        }
+    [Test]
+    public void TestLf2()
+    {
+        // When limited == true, we limit the internal buffer exactly after the first new line char '\n'
+        var lineReader = new LineReader("123\n456");
+        Assert.AreEqual("123", lineReader.ReadLine().ToString());
+        Assert.AreEqual(4, lineReader.SourcePosition);
+        Assert.AreEqual("456", lineReader.ReadLine().ToString());
+        Assert.Null(lineReader.ReadLine().Text);
+    }
 
-        [Test]
-        public void TestCr()
-        {
-            var lineReader = new LineReader("123\r");
-            Assert.AreEqual("123", lineReader.ReadLine().ToString());
-            Assert.AreEqual(4, lineReader.SourcePosition);
-            Assert.Null(lineReader.ReadLine().Text);
-        }
+    [Test]
+    public void TestCr()
+    {
+        var lineReader = new LineReader("123\r");
+        Assert.AreEqual("123", lineReader.ReadLine().ToString());
+        Assert.AreEqual(4, lineReader.SourcePosition);
+        Assert.Null(lineReader.ReadLine().Text);
+    }
 
-        [Test]
-        public void TestCr2()
-        {
-            var lineReader = new LineReader("123\r456");
-            Assert.AreEqual("123", lineReader.ReadLine().ToString());
-            Assert.AreEqual(4, lineReader.SourcePosition);
-            Assert.AreEqual("456", lineReader.ReadLine().ToString());
-            Assert.Null(lineReader.ReadLine().Text);
-        }
+    [Test]
+    public void TestCr2()
+    {
+        var lineReader = new LineReader("123\r456");
+        Assert.AreEqual("123", lineReader.ReadLine().ToString());
+        Assert.AreEqual(4, lineReader.SourcePosition);
+        Assert.AreEqual("456", lineReader.ReadLine().ToString());
+        Assert.Null(lineReader.ReadLine().Text);
+    }
 
-        [Test]
-        public void TestCrLf()
-        {
-            // When limited == true, we limit the internal buffer exactly after the first new line char '\r'
-            // and we check that we don't get a new line for `\n` 
-            var lineReader = new LineReader("123\r\n");
-            Assert.AreEqual("123", lineReader.ReadLine().ToString());
-            Assert.AreEqual(5, lineReader.SourcePosition);
-            Assert.Null(lineReader.ReadLine().Text);
-        }
+    [Test]
+    public void TestCrLf()
+    {
+        // When limited == true, we limit the internal buffer exactly after the first new line char '\r'
+        // and we check that we don't get a new line for `\n` 
+        var lineReader = new LineReader("123\r\n");
+        Assert.AreEqual("123", lineReader.ReadLine().ToString());
+        Assert.AreEqual(5, lineReader.SourcePosition);
+        Assert.Null(lineReader.ReadLine().Text);
+    }
 
-        [Test]
-        public void TestCrLf2()
-        {
-            var lineReader = new LineReader("123\r\n456");
-            Assert.AreEqual("123", lineReader.ReadLine().ToString());
-            Assert.AreEqual(5, lineReader.SourcePosition);
-            Assert.AreEqual("456", lineReader.ReadLine().ToString());
-            Assert.Null(lineReader.ReadLine().Text);
-        }
+    [Test]
+    public void TestCrLf2()
+    {
+        var lineReader = new LineReader("123\r\n456");
+        Assert.AreEqual("123", lineReader.ReadLine().ToString());
+        Assert.AreEqual(5, lineReader.SourcePosition);
+        Assert.AreEqual("456", lineReader.ReadLine().ToString());
+        Assert.Null(lineReader.ReadLine().Text);
     }
 }

src/Markdig.Tests/TestLinkHelper.cs

@@ -2,374 +2,395 @@
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
 
-using NUnit.Framework;
 using Markdig.Helpers;
 using Markdig.Syntax;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestLinkHelper
 {
-    [TestFixture]
-    public class TestLinkHelper
+    [Test]
+    public void TestUrlSimple()
     {
-        [Test]
-        public void TestUrlSimple()
-        {
-            var text = new StringSlice("toto tutu");
-            Assert.True(LinkHelper.TryParseUrl(ref text, out string link, out _));
-            Assert.AreEqual("toto", link);
-            Assert.AreEqual(' ', text.CurrentChar);
-        }
+        var text = new StringSlice("toto tutu");
+        Assert.True(LinkHelper.TryParseUrl(ref text, out string link, out _));
+        Assert.AreEqual("toto", link);
+        Assert.AreEqual(' ', text.CurrentChar);
+    }
 
-        [Test]
-        public void TestUrlUrl()
-        {
-            var text = new StringSlice("http://google.com)");
-            Assert.True(LinkHelper.TryParseUrl(ref text, out string link, out _));
-            Assert.AreEqual("http://google.com", link);
-            Assert.AreEqual(')', text.CurrentChar);
-        }
+    [Test]
+    public void TestUrlUrl()
+    {
+        var text = new StringSlice("http://google.com)");
+        Assert.True(LinkHelper.TryParseUrl(ref text, out string link, out _));
+        Assert.AreEqual("http://google.com", link);
+        Assert.AreEqual(')', text.CurrentChar);
+    }
 
-        [Test]
-        [TestCase("http://google.com.")]
-        [TestCase("http://google.com. ")]
-        public void TestUrlTrailingFullStop(string uri)
-        {
-            var text = new StringSlice(uri);
-            Assert.True(LinkHelper.TryParseUrl(ref text, out string link, out _, true));
-            Assert.AreEqual("http://google.com", link);
-            Assert.AreEqual('.', text.CurrentChar);
-        }
+    [Test]
+    [TestCase("http://google.com.")]
+    [TestCase("http://google.com. ")]
+    public void TestUrlTrailingFullStop(string uri)
+    {
+        var text = new StringSlice(uri);
+        Assert.True(LinkHelper.TryParseUrl(ref text, out string link, out _, true));
+        Assert.AreEqual("http://google.com", link);
+        Assert.AreEqual('.', text.CurrentChar);
+    }
 
-        [Test]
-        public void TestUrlNestedParenthesis()
-        {
-            var text = new StringSlice("(toto)tutu(tata) nooo");
-            Assert.True(LinkHelper.TryParseUrl(ref text, out string link, out _));
-            Assert.AreEqual("(toto)tutu(tata)", link);
-            Assert.AreEqual(' ', text.CurrentChar);
-        }
+    [Test]
+    public void TestUrlNestedParenthesis()
+    {
+        var text = new StringSlice("(toto)tutu(tata) nooo");
+        Assert.True(LinkHelper.TryParseUrl(ref text, out string link, out _));
+        Assert.AreEqual("(toto)tutu(tata)", link);
+        Assert.AreEqual(' ', text.CurrentChar);
+    }
 
-        [Test]
-        public void TestUrlAlternate()
-        {
-            var text = new StringSlice("<toto_tata_tutu> nooo");
-            Assert.True(LinkHelper.TryParseUrl(ref text, out string link, out _));
-            Assert.AreEqual("toto_tata_tutu", link);
-            Assert.AreEqual(' ', text.CurrentChar);
-        }
+    [Test]
+    public void TestUrlAlternate()
+    {
+        var text = new StringSlice("<toto_tata_tutu> nooo");
+        Assert.True(LinkHelper.TryParseUrl(ref text, out string link, out _));
+        Assert.AreEqual("toto_tata_tutu", link);
+        Assert.AreEqual(' ', text.CurrentChar);
+    }
 
-        [Test]
-        public void TestUrlAlternateInvalid()
-        {
-            var text = new StringSlice("<toto_tata_tutu");
-            Assert.False(LinkHelper.TryParseUrl(ref text, out string link, out _));
-        }
+    [Test]
+    public void TestUrlAlternateInvalid()
+    {
+        var text = new StringSlice("<toto_tata_tutu");
+        Assert.False(LinkHelper.TryParseUrl(ref text, out string link, out _));
+    }
 
-        [Test]
-        public void TestTitleSimple()
-        {
-            var text = new StringSlice(@"'tata\tutu\''");
-            Assert.True(LinkHelper.TryParseTitle(ref text, out string title, out _));
-            Assert.AreEqual(@"tata\tutu'", title);
-        }
+    [Test]
+    public void TestTitleSimple()
+    {
+        var text = new StringSlice(@"'tata\tutu\''");
+        Assert.True(LinkHelper.TryParseTitle(ref text, out string title, out _));
+        Assert.AreEqual(@"tata\tutu'", title);
+    }
 
-        [Test]
-        public void TestTitleSimpleAlternate()
-        {
-            var text = new StringSlice(@"""tata\tutu\"""" ");
-            Assert.True(LinkHelper.TryParseTitle(ref text, out string title, out _));
-            Assert.AreEqual(@"tata\tutu""", title);
-            Assert.AreEqual(' ', text.CurrentChar);
-        }
+    [Test]
+    public void TestTitleSimpleAlternate()
+    {
+        var text = new StringSlice(@"""tata\tutu\"""" ");
+        Assert.True(LinkHelper.TryParseTitle(ref text, out string title, out _));
+        Assert.AreEqual(@"tata\tutu""", title);
+        Assert.AreEqual(' ', text.CurrentChar);
+    }
 
-        [Test]
-        public void TestUrlAndTitle()
-        {
-            //                           0         1         2         3
-            //                           0123456789012345678901234567890123456789
-            var text = new StringSlice(@"(http://google.com 'this is a title')ABC");
-            Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
-            Assert.AreEqual("http://google.com", link);
-            Assert.AreEqual("this is a title", title);
-            Assert.AreEqual(new SourceSpan(1, 17), linkSpan);
-            Assert.AreEqual(new SourceSpan(19, 35), titleSpan);
-            Assert.AreEqual('A', text.CurrentChar);
-        }
+    [Test]
+    public void TestTitleMultiline()
+    {
+        var text = new StringSlice("'this\ris\r\na\ntitle'");
+        Assert.True(LinkHelper.TryParseTitle(ref text, out string title, out _));
+        Assert.AreEqual("this\ris\r\na\ntitle", title);
+    }
 
-        [Test]
-        public void TestUrlAndTitleEmpty()
-        {
-            //                           01234
-            var text = new StringSlice(@"(<>)A");
-            Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
-            Assert.AreEqual(string.Empty, link);
-            Assert.AreEqual(string.Empty, title);
-            Assert.AreEqual(new SourceSpan(1, 2), linkSpan);
-            Assert.AreEqual(SourceSpan.Empty, titleSpan);
-            Assert.AreEqual('A', text.CurrentChar);
-        }
+    [Test]
+    public void TestTitleMultilineWithSpaceAndBackslash()
+    {
+        var text = new StringSlice("'a\n\\ \\\ntitle'");
+        Assert.True(LinkHelper.TryParseTitle(ref text, out string title, out _));
+        Assert.AreEqual("a\n\\ \\\ntitle", title);
+    }
 
-        [Test]
-        public void TestUrlAndTitleEmpty2()
-        {
-            //                           012345
-            var text = new StringSlice(@"( <> )A");
-            Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
-            Assert.AreEqual(string.Empty, link);
-            Assert.AreEqual(string.Empty, title);
-            Assert.AreEqual(new SourceSpan(2, 3), linkSpan);
-            Assert.AreEqual(SourceSpan.Empty, titleSpan);
-            Assert.AreEqual('A', text.CurrentChar);
-        }
+    [Test]
+    public void TestUrlAndTitle()
+    {
+        //                           0         1         2         3
+        //                           0123456789012345678901234567890123456789
+        var text = new StringSlice(@"(http://google.com 'this is a title')ABC");
+        Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
+        Assert.AreEqual("http://google.com", link);
+        Assert.AreEqual("this is a title", title);
+        Assert.AreEqual(new SourceSpan(1, 17), linkSpan);
+        Assert.AreEqual(new SourceSpan(19, 35), titleSpan);
+        Assert.AreEqual('A', text.CurrentChar);
+    }
+
+    [Test]
+    public void TestUrlEmptyAndTitleNull()
+    {
+        //                           01234
+        var text = new StringSlice(@"(<>)A");
+        Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
+        Assert.AreEqual(string.Empty, link);
+        Assert.AreEqual(null, title);
+        Assert.AreEqual(new SourceSpan(1, 2), linkSpan);
+        Assert.AreEqual(SourceSpan.Empty, titleSpan);
+        Assert.AreEqual('A', text.CurrentChar);
+    }
+
+    [Test]
+    public void TestUrlEmptyAndTitleNull2()
+    {
+        //                           012345
+        var text = new StringSlice(@"( <> )A");
+        Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
+        Assert.AreEqual(string.Empty, link);
+        Assert.AreEqual(null, title);
+        Assert.AreEqual(new SourceSpan(2, 3), linkSpan);
+        Assert.AreEqual(SourceSpan.Empty, titleSpan);
+        Assert.AreEqual('A', text.CurrentChar);
+    }
 
 
-        [Test]
-        public void TestUrlEmptyWithTitleWithMultipleSpaces()
-        {
-            //                           0         1         2
-            //                           0123456789012345678901234567
-            var text = new StringSlice(@"(   <>      'toto'       )A");
-            Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
-            Assert.AreEqual(string.Empty, link);
-            Assert.AreEqual("toto", title);
-            Assert.AreEqual(new SourceSpan(4, 5), linkSpan);
-            Assert.AreEqual(new SourceSpan(12, 17), titleSpan);
-            Assert.AreEqual('A', text.CurrentChar);
-        }
+    [Test]
+    public void TestUrlEmptyWithTitleWithMultipleSpaces()
+    {
+        //                           0         1         2
+        //                           0123456789012345678901234567
+        var text = new StringSlice(@"(   <>      'toto'       )A");
+        Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
+        Assert.AreEqual(string.Empty, link);
+        Assert.AreEqual("toto", title);
+        Assert.AreEqual(new SourceSpan(4, 5), linkSpan);
+        Assert.AreEqual(new SourceSpan(12, 17), titleSpan);
+        Assert.AreEqual('A', text.CurrentChar);
+    }
 
-        [Test]
-        public void TestUrlEmpty()
-        {
-            var text = new StringSlice(@"()A");
-            Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
-            Assert.AreEqual(string.Empty, link);
-            Assert.AreEqual(string.Empty, title);
-            Assert.AreEqual(SourceSpan.Empty, linkSpan);
-            Assert.AreEqual(SourceSpan.Empty, titleSpan);
-            Assert.AreEqual('A', text.CurrentChar);
-        }
+    [Test]
+    public void TestUrlEmpty()
+    {
+        var text = new StringSlice(@"()A");
+        Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
+        Assert.AreEqual(string.Empty, link);
+        Assert.AreEqual(null, title);
+        Assert.AreEqual(SourceSpan.Empty, linkSpan);
+        Assert.AreEqual(SourceSpan.Empty, titleSpan);
+        Assert.AreEqual('A', text.CurrentChar);
+    }
 
-        [Test]
-        public void TestMultipleLines()
-        {
-            //                          0          1         2          3
-            //                          01 2345678901234567890 1234567890123456789
-            var text = new StringSlice("(\n<http://google.com>\n    'toto' )A");
-            Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
-            Assert.AreEqual("http://google.com", link);
-            Assert.AreEqual("toto", title);
-            Assert.AreEqual(new SourceSpan(2, 20), linkSpan);
-            Assert.AreEqual(new SourceSpan(26, 31), titleSpan);
-            Assert.AreEqual('A', text.CurrentChar);
-        }
+    [Test]
+    public void TestMultipleLines()
+    {
+        //                          0          1         2          3
+        //                          01 2345678901234567890 1234567890123456789
+        var text = new StringSlice("(\n<http://google.com>\n    'toto' )A");
+        Assert.True(LinkHelper.TryParseInlineLink(ref text, out string link, out string title, out SourceSpan linkSpan, out SourceSpan titleSpan));
+        Assert.AreEqual("http://google.com", link);
+        Assert.AreEqual("toto", title);
+        Assert.AreEqual(new SourceSpan(2, 20), linkSpan);
+        Assert.AreEqual(new SourceSpan(26, 31), titleSpan);
+        Assert.AreEqual('A', text.CurrentChar);
+    }
 
-        [Test]
-        public void TestLabelSimple()
-        {
-            //                          01234
-            var text = new StringSlice("[foo]");
-            Assert.True(LinkHelper.TryParseLabel(ref text, out string label, out SourceSpan labelSpan));
-            Assert.AreEqual(new SourceSpan(1, 3), labelSpan);
-            Assert.AreEqual("foo", label);
-        }
+    [Test]
+    public void TestLabelSimple()
+    {
+        //                          01234
+        var text = new StringSlice("[foo]");
+        Assert.True(LinkHelper.TryParseLabel(ref text, out string label, out SourceSpan labelSpan));
+        Assert.AreEqual(new SourceSpan(1, 3), labelSpan);
+        Assert.AreEqual("foo", label);
+    }
 
-        [Test]
-        public void TestLabelEscape()
-        {
-            //                           012345678
-            var text = new StringSlice(@"[fo\[\]o]");
-            Assert.True(LinkHelper.TryParseLabel(ref text, out string label, out SourceSpan labelSpan));
-            Assert.AreEqual(new SourceSpan(1, 7), labelSpan);
-            Assert.AreEqual(@"fo[]o", label);
-        }
+    [Test]
+    public void TestLabelEscape()
+    {
+        //                           012345678
+        var text = new StringSlice(@"[fo\[\]o]");
+        Assert.True(LinkHelper.TryParseLabel(ref text, out string label, out SourceSpan labelSpan));
+        Assert.AreEqual(new SourceSpan(1, 7), labelSpan);
+        Assert.AreEqual(@"fo[]o", label);
+    }
 
-        [Test]
-        public void TestLabelEscape2()
-        {
-            //                           0123
-            var text = new StringSlice(@"[\]]");
-            Assert.True(LinkHelper.TryParseLabel(ref text, out string label, out SourceSpan labelSpan));
-            Assert.AreEqual(new SourceSpan(1, 2), labelSpan);
-            Assert.AreEqual(@"]", label);
-        }
+    [Test]
+    public void TestLabelEscape2()
+    {
+        //                           0123
+        var text = new StringSlice(@"[\]]");
+        Assert.True(LinkHelper.TryParseLabel(ref text, out string label, out SourceSpan labelSpan));
+        Assert.AreEqual(new SourceSpan(1, 2), labelSpan);
+        Assert.AreEqual(@"]", label);
+    }
 
-        [Test]
-        public void TestLabelInvalids()
-        {
-            Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"a"), out string label));
-            Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"["), out label));
-            Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"[\x]"), out label));
-            Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"[[]"), out label));
-            Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"[     ]"), out label));
-            Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"[  \t \n  ]"), out label));
-        }
+    [Test]
+    public void TestLabelInvalids()
+    {
+        Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"a"), out string label));
+        Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"["), out label));
+        Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"[\x]"), out label));
+        Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"[[]"), out label));
+        Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"[     ]"), out label));
+        Assert.False(LinkHelper.TryParseLabel(new StringSlice(@"[  \t \n  ]"), out label));
+    }
 
-        [Test]
-        public void TestLabelWhitespaceCollapsedAndTrim()
-        {
-            //                           0         1         2         3
-            //                           0123456789012345678901234567890123456789
-            var text = new StringSlice(@"[     fo    o    z     ]");
-            Assert.True(LinkHelper.TryParseLabel(ref text, out string label, out SourceSpan labelSpan));
-            Assert.AreEqual(new SourceSpan(6, 17), labelSpan);
-            Assert.AreEqual(@"fo o z", label);
-        }
+    [Test]
+    public void TestLabelWhitespaceCollapsedAndTrim()
+    {
+        //                           0         1         2         3
+        //                           0123456789012345678901234567890123456789
+        var text = new StringSlice(@"[     fo    o    z     ]");
+        Assert.True(LinkHelper.TryParseLabel(ref text, out string label, out SourceSpan labelSpan));
+        Assert.AreEqual(new SourceSpan(6, 17), labelSpan);
+        Assert.AreEqual(@"fo o z", label);
+    }
 
-        [Test]
-        public void TestlLinkReferenceDefinitionSimple()
-        {
-            //                           0         1         2         3
-            //                           0123456789012345678901234567890123456789
-            var text = new StringSlice(@"[foo]: /toto 'title'");
-            Assert.True(LinkHelper.TryParseLinkReferenceDefinition(ref text, out string label, out string url, out string title, out SourceSpan labelSpan, out SourceSpan urlSpan, out SourceSpan titleSpan));
-            Assert.AreEqual(@"foo", label);
-            Assert.AreEqual(@"/toto", url);
-            Assert.AreEqual(@"title", title);
-            Assert.AreEqual(new SourceSpan(1, 3), labelSpan);
-            Assert.AreEqual(new SourceSpan(7, 11), urlSpan);
-            Assert.AreEqual(new SourceSpan(13, 19), titleSpan);
+    [Test]
+    public void TestlLinkReferenceDefinitionSimple()
+    {
+        //                           0         1         2         3
+        //                           0123456789012345678901234567890123456789
+        var text = new StringSlice(@"[foo]: /toto 'title'");
+        Assert.True(LinkHelper.TryParseLinkReferenceDefinition(ref text, out string label, out string url, out string title, out SourceSpan labelSpan, out SourceSpan urlSpan, out SourceSpan titleSpan));
+        Assert.AreEqual(@"foo", label);
+        Assert.AreEqual(@"/toto", url);
+        Assert.AreEqual(@"title", title);
+        Assert.AreEqual(new SourceSpan(1, 3), labelSpan);
+        Assert.AreEqual(new SourceSpan(7, 11), urlSpan);
+        Assert.AreEqual(new SourceSpan(13, 19), titleSpan);
 
-        }
+    }
 
-        [Test]
-        public void TestAutoLinkUrlSimple()
-        {
-            var text = new StringSlice(@"<http://google.com>");
-            Assert.True(LinkHelper.TryParseAutolink(ref text, out string url, out bool isEmail));
-            Assert.False(isEmail);
-            Assert.AreEqual("http://google.com", url);
-        }
+    [Test]
+    public void TestlLinkReferenceDefinitionInvalid()
+    {
+        var text = new StringSlice("[foo]: /url (title) x\n");
+        Assert.False(LinkHelper.TryParseLinkReferenceDefinition(ref text, out _, out _, out _, out _, out _, out _));
+    }
 
-        [Test]
-        public void TestAutoLinkEmailSimple()
-        {
-            var text = new StringSlice(@"<user@host.com>");
-            Assert.True(LinkHelper.TryParseAutolink(ref text, out string email, out bool isEmail));
-            Assert.True(isEmail);
-            Assert.AreEqual("user@host.com", email);
-        }
+    [Test]
+    public void TestAutoLinkUrlSimple()
+    {
+        var text = new StringSlice(@"<http://google.com>");
+        Assert.True(LinkHelper.TryParseAutolink(ref text, out string url, out bool isEmail));
+        Assert.False(isEmail);
+        Assert.AreEqual("http://google.com", url);
+    }
 
-        [Test]
-        public void TestAutolinkInvalid()
-        {
-            Assert.False(LinkHelper.TryParseAutolink(new StringSlice(@""), out string text, out bool isEmail));
-            Assert.False(LinkHelper.TryParseAutolink(new StringSlice(@"<"), out text, out isEmail));
-            Assert.False(LinkHelper.TryParseAutolink(new StringSlice(@"<ab"), out text, out isEmail));
-            Assert.False(LinkHelper.TryParseAutolink(new StringSlice(@"<user@>"), out text, out isEmail));
-        }
+    [Test]
+    public void TestAutoLinkEmailSimple()
+    {
+        var text = new StringSlice(@"<user@host.com>");
+        Assert.True(LinkHelper.TryParseAutolink(ref text, out string email, out bool isEmail));
+        Assert.True(isEmail);
+        Assert.AreEqual("user@host.com", email);
+    }
 
-        [TestCase("Header identifiers in HTML", "header-identifiers-in-html")]
-        [TestCase("* Dogs*?--in *my* house?", "dogs-in-my-house")] // Not Pandoc equivalent: dogs--in...
-        [TestCase("[HTML], [S5], or [RTF]?", "html-s5-or-rtf")]
-        [TestCase("3. Applications", "applications")]
-        [TestCase("33", "")]
-        public void TestUrilizeNonAscii_Pandoc(string input, string expectedResult)
-        {
-            Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, false));
-        }
+    [Test]
+    public void TestAutolinkInvalid()
+    {
+        Assert.False(LinkHelper.TryParseAutolink(new StringSlice(@""), out string text, out bool isEmail));
+        Assert.False(LinkHelper.TryParseAutolink(new StringSlice(@"<"), out text, out isEmail));
+        Assert.False(LinkHelper.TryParseAutolink(new StringSlice(@"<ab"), out text, out isEmail));
+        Assert.False(LinkHelper.TryParseAutolink(new StringSlice(@"<user@>"), out text, out isEmail));
+    }
 
-        [TestCase("Header identifiers in HTML", "header-identifiers-in-html")]
-        [TestCase("* Dogs*?--in *my* house?", "-dogs--in-my-house")]
-        [TestCase("[HTML], [S5], or [RTF]?", "html-s5-or-rtf")]
-        [TestCase("3. Applications", "3-applications")]
-        [TestCase("33", "33")]
-        public void TestUrilizeGfm(string input, string expectedResult)
-        {
-            Assert.AreEqual(expectedResult, LinkHelper.UrilizeAsGfm(input));
-        }
+    [TestCase("Header identifiers in HTML", "header-identifiers-in-html")]
+    [TestCase("* Dogs*?--in *my* house?", "dogs-in-my-house")] // Not Pandoc equivalent: dogs--in...
+    [TestCase("[HTML], [S5], or [RTF]?", "html-s5-or-rtf")]
+    [TestCase("3. Applications", "applications")]
+    [TestCase("33", "")]
+    public void TestUrilizeNonAscii_Pandoc(string input, string expectedResult)
+    {
+        Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, false));
+    }
 
-        [TestCase("abc", "abc")]
-        [TestCase("a-c", "a-c")]
-        [TestCase("a c", "a-c")]
-        [TestCase("a_c", "a_c")]
-        [TestCase("a.c", "a.c")]
-        [TestCase("a,c", "ac")]
-        [TestCase("a--", "a")] // Not Pandoc-equivalent: a--
-        [TestCase("a__", "a")] // Not Pandoc-equivalent: a__
-        [TestCase("a..", "a")] // Not Pandoc-equivalent: a..
-        [TestCase("a??", "a")]
-        [TestCase("a  ", "a")]
-        [TestCase("a--d", "a-d")]
-        [TestCase("a__d", "a_d")]
-        [TestCase("a??d", "ad")]
-        [TestCase("a  d", "a-d")]
-        [TestCase("a..d", "a.d")]
-        [TestCase("-bc", "bc")]
-        [TestCase("_bc", "bc")]
-        [TestCase(" bc", "bc")]
-        [TestCase("?bc", "bc")]
-        [TestCase(".bc", "bc")]
-        [TestCase("a-.-", "a")] // Not Pandoc equivalent: a-.-
-        public void TestUrilizeOnlyAscii_Simple(string input, string expectedResult)
-        {
-            Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, true));
-        }
+    [TestCase("Header identifiers in HTML", "header-identifiers-in-html")]
+    [TestCase("* Dogs*?--in *my* house?", "-dogs--in-my-house")]
+    [TestCase("[HTML], [S5], or [RTF]?", "html-s5-or-rtf")]
+    [TestCase("3. Applications", "3-applications")]
+    [TestCase("33", "33")]
+    public void TestUrilizeGfm(string input, string expectedResult)
+    {
+        Assert.AreEqual(expectedResult, LinkHelper.UrilizeAsGfm(input));
+    }
 
-        [TestCase("bær", "br")]
-        [TestCase("bør", "br")]
-        [TestCase("bΘr", "br")]
-        [TestCase("四五", "")]
-        public void TestUrilizeOnlyAscii_NonAscii(string input, string expectedResult)
-        {
-            Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, true));
-        }
+    [TestCase("abc", "abc")]
+    [TestCase("a-c", "a-c")]
+    [TestCase("a c", "a-c")]
+    [TestCase("a_c", "a_c")]
+    [TestCase("a.c", "a.c")]
+    [TestCase("a,c", "ac")]
+    [TestCase("a--", "a")] // Not Pandoc-equivalent: a--
+    [TestCase("a__", "a")] // Not Pandoc-equivalent: a__
+    [TestCase("a..", "a")] // Not Pandoc-equivalent: a..
+    [TestCase("a??", "a")]
+    [TestCase("a  ", "a")]
+    [TestCase("a--d", "a-d")]
+    [TestCase("a__d", "a_d")]
+    [TestCase("a??d", "ad")]
+    [TestCase("a  d", "a-d")]
+    [TestCase("a..d", "a.d")]
+    [TestCase("-bc", "bc")]
+    [TestCase("_bc", "bc")]
+    [TestCase(" bc", "bc")]
+    [TestCase("?bc", "bc")]
+    [TestCase(".bc", "bc")]
+    [TestCase("a-.-", "a")] // Not Pandoc equivalent: a-.-
+    public void TestUrilizeOnlyAscii_Simple(string input, string expectedResult)
+    {
+        Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, true));
+    }
 
-        [TestCase("bár", "bar")]
-        [TestCase("àrrivé", "arrive")]
-        public void TestUrilizeOnlyAscii_Normalization(string input, string expectedResult)
-        {
-            Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, true));
-        }
+    [TestCase("bær", "br")]
+    [TestCase("bør", "br")]
+    [TestCase("bΘr", "br")]
+    [TestCase("四五", "")]
+    public void TestUrilizeOnlyAscii_NonAscii(string input, string expectedResult)
+    {
+        Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, true));
+    }
 
-        [TestCase("123", "")]
-        [TestCase("1,-b", "b")]
-        [TestCase("b1,-", "b1")] // Not Pandoc equivalent: b1-
-        [TestCase("ab3", "ab3")]
-        [TestCase("ab3de", "ab3de")]
-        public void TestUrilizeOnlyAscii_Numeric(string input, string expectedResult)
-        {
-            Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, true));
-        }
+    [TestCase("bár", "bar")]
+    [TestCase("àrrivé", "arrive")]
+    public void TestUrilizeOnlyAscii_Normalization(string input, string expectedResult)
+    {
+        Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, true));
+    }
 
-        [TestCase("一二三四五", "一二三四五")]
-        [TestCase("一,-b", "一-b")]
-        public void TestUrilizeNonAscii_NonAsciiNumeric(string input, string expectedResult)
-        {
-            Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, false));
-        }
+    [TestCase("123", "")]
+    [TestCase("1,-b", "b")]
+    [TestCase("b1,-", "b1")] // Not Pandoc equivalent: b1-
+    [TestCase("ab3", "ab3")]
+    [TestCase("ab3de", "ab3de")]
+    public void TestUrilizeOnlyAscii_Numeric(string input, string expectedResult)
+    {
+        Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, true));
+    }
 
-        [TestCase("bær", "bær")]
-        [TestCase("æ5el", "æ5el")]
-        [TestCase("-æ5el", "æ5el")]
-        [TestCase("-frø-", "frø")]
-        [TestCase("-fr-ø", "fr-ø")]
-        public void TestUrilizeNonAscii_Simple(string input, string expectedResult)
-        {
-            Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, false));
-        }
+    [TestCase("一二三四五", "一二三四五")]
+    [TestCase("一,-b", "一-b")]
+    public void TestUrilizeNonAscii_NonAsciiNumeric(string input, string expectedResult)
+    {
+        Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, false));
+    }
 
-        // Just to be sure, test for characters expressly forbidden in URI fragments:
-        [TestCase("b#r", "br")]
-        [TestCase("b%r", "br")] // Invalid except as an escape character
-        [TestCase("b^r", "br")]
-        [TestCase("b[r", "br")]
-        [TestCase("b]r", "br")]
-        [TestCase("b{r", "br")]
-        [TestCase("b}r", "br")]
-        [TestCase("b<r", "br")]
-        [TestCase("b>r", "br")]
-        [TestCase(@"b\r", "br")]
-        [TestCase(@"b""r", "br")]
-        [TestCase(@"Requirement 😀", "requirement")]
-        public void TestUrilizeNonAscii_NonValidCharactersForFragments(string input, string expectedResult)
-        {
-            Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, false));
-        }
+    [TestCase("bær", "bær")]
+    [TestCase("æ5el", "æ5el")]
+    [TestCase("-æ5el", "æ5el")]
+    [TestCase("-frø-", "frø")]
+    [TestCase("-fr-ø", "fr-ø")]
+    public void TestUrilizeNonAscii_Simple(string input, string expectedResult)
+    {
+        Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, false));
+    }
 
-        [Test]
-        public void TestUnicodeInDomainNameOfLinkReferenceDefinition()
-        {
-            TestParser.TestSpec("[Foo]\n\n[Foo]: http://ünicode.com", "<p><a href=\"http://xn--nicode-2ya.com\">Foo</a></p>");
-        }
+    // Just to be sure, test for characters expressly forbidden in URI fragments:
+    [TestCase("b#r", "br")]
+    [TestCase("b%r", "br")] // Invalid except as an escape character
+    [TestCase("b^r", "br")]
+    [TestCase("b[r", "br")]
+    [TestCase("b]r", "br")]
+    [TestCase("b{r", "br")]
+    [TestCase("b}r", "br")]
+    [TestCase("b<r", "br")]
+    [TestCase("b>r", "br")]
+    [TestCase(@"b\r", "br")]
+    [TestCase(@"b""r", "br")]
+    [TestCase(@"Requirement 😀", "requirement")]
+    public void TestUrilizeNonAscii_NonValidCharactersForFragments(string input, string expectedResult)
+    {
+        Assert.AreEqual(expectedResult, LinkHelper.Urilize(input, false));
+    }
+
+    [Test]
+    public void TestUnicodeInDomainNameOfLinkReferenceDefinition()
+    {
+        TestParser.TestSpec("[Foo]\n\n[Foo]: http://ünicode.com", "<p><a href=\"http://xn--nicode-2ya.com\">Foo</a></p>");
     }
 }

src/Markdig.Tests/TestLinkRewriter.cs

@@ -1,44 +1,40 @@
-using System;
-using System.IO;
 using Markdig.Parsers;
 using Markdig.Renderers;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestLinkRewriter
 {
-    public class TestLinkRewriter
+    [Test]
+    public void ReplacesRelativeLinks()
     {
-        [Test]
-        public void ReplacesRelativeLinks()
-        {
-            TestSpec(s => "abc" + s, "Link: [hello](/relative.jpg)", "abc/relative.jpg");
-            TestSpec(s => s + "xyz", "Link: [hello](relative.jpg)", "relative.jpgxyz");
-            TestSpec(null, "Link: [hello](relative.jpg)", "relative.jpg");
-            TestSpec(null, "Link: [hello](/relative.jpg)", "/relative.jpg");
-        }
+        TestSpec(s => "abc" + s, "Link: [hello](/relative.jpg)", "abc/relative.jpg");
+        TestSpec(s => s + "xyz", "Link: [hello](relative.jpg)", "relative.jpgxyz");
+        TestSpec(null, "Link: [hello](relative.jpg)", "relative.jpg");
+        TestSpec(null, "Link: [hello](/relative.jpg)", "/relative.jpg");
+    }
 
-        [Test]
-        public void ReplacesRelativeImageSources()
-        {
-            TestSpec(s => "abc" + s, "Image: ![alt text](/image.jpg)", "abc/image.jpg");
-            TestSpec(s => "abc" + s, "Image: ![alt text](image.jpg \"title\")", "abcimage.jpg");
-            TestSpec(null, "Image: ![alt text](/image.jpg)", "/image.jpg");
-        }
+    [Test]
+    public void ReplacesRelativeImageSources()
+    {
+        TestSpec(s => "abc" + s, "Image: ![alt text](/image.jpg)", "abc/image.jpg");
+        TestSpec(s => "abc" + s, "Image: ![alt text](image.jpg \"title\")", "abcimage.jpg");
+        TestSpec(null, "Image: ![alt text](/image.jpg)", "/image.jpg");
+    }
 
-        public static void TestSpec(Func<string,string> linkRewriter, string markdown, string expectedLink)
-        {
-            var pipeline = new MarkdownPipelineBuilder().Build();
+    public static void TestSpec(Func<string,string> linkRewriter, string markdown, string expectedLink)
+    {
+        var pipeline = new MarkdownPipelineBuilder().Build();
 
-            var writer = new StringWriter();
-            var renderer = new HtmlRenderer(writer);
-            renderer.LinkRewriter = linkRewriter;
-            pipeline.Setup(renderer);
+        var writer = new StringWriter();
+        var renderer = new HtmlRenderer(writer);
+        renderer.LinkRewriter = linkRewriter;
+        pipeline.Setup(renderer);
 
-            var document = MarkdownParser.Parse(markdown, pipeline);
-            renderer.Render(document);
-            writer.Flush();
+        var document = MarkdownParser.Parse(markdown, pipeline);
+        renderer.Render(document);
+        writer.Flush();
 
-            Assert.That(writer.ToString(), Contains.Substring("=\"" + expectedLink + "\""));
-        }
+        Assert.That(writer.ToString(), Contains.Substring("=\"" + expectedLink + "\""));
     }
 }

src/Markdig.Tests/TestMarkdigCoreApi.cs

@@ -1,217 +1,214 @@
 using Markdig.Renderers;
 using Markdig.Syntax;
 using Markdig.Syntax.Inlines;
-using NUnit.Framework;
-using System.IO;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestMarkdigCoreApi
 {
-    public class TestMarkdigCoreApi
+    [Test]
+    public void TestToHtml()
     {
-        [Test]
-        public void TestToHtml()
+        for (int i = 0; i < 5; i++)
         {
-            for (int i = 0; i < 5; i++)
-            {
-                string html = Markdown.ToHtml("This is a text with some *emphasis*");
-                Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
+            string html = Markdown.ToHtml("This is a text with some *emphasis*");
+            Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
 
-                html = Markdown.ToHtml("This is a text with a https://link.tld/");
-                Assert.AreNotEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
-            }
+            html = Markdown.ToHtml("This is a text with a https://link.tld/");
+            Assert.AreNotEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
+        }
+    }
+
+    [Test]
+    public void TestToHtmlWithPipeline()
+    {
+        var pipeline = new MarkdownPipelineBuilder()
+            .Build();
+
+        for (int i = 0; i < 5; i++)
+        {
+            string html = Markdown.ToHtml("This is a text with some *emphasis*", pipeline);
+            Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
+
+            html = Markdown.ToHtml("This is a text with a https://link.tld/", pipeline);
+            Assert.AreNotEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
         }
 
-        [Test]
-        public void TestToHtmlWithPipeline()
+        pipeline = new MarkdownPipelineBuilder()
+            .UseAdvancedExtensions()
+            .Build();
+
+        for (int i = 0; i < 5; i++)
         {
-            var pipeline = new MarkdownPipelineBuilder()
-                .Build();
+            string html = Markdown.ToHtml("This is a text with a https://link.tld/", pipeline);
+            Assert.AreEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
+        }
+    }
 
-            for (int i = 0; i < 5; i++)
-            {
-                string html = Markdown.ToHtml("This is a text with some *emphasis*", pipeline);
-                Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
+    [Test]
+    public void TestToHtmlWithWriter()
+    {
+        var writer = new StringWriter();
 
-                html = Markdown.ToHtml("This is a text with a https://link.tld/", pipeline);
-                Assert.AreNotEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
-            }
-
-            pipeline = new MarkdownPipelineBuilder()
-                .UseAdvancedExtensions()
-                .Build();
-
-            for (int i = 0; i < 5; i++)
-            {
-                string html = Markdown.ToHtml("This is a text with a https://link.tld/", pipeline);
-                Assert.AreEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
-            }
+        for (int i = 0; i < 5; i++)
+        {
+            _ = Markdown.ToHtml("This is a text with some *emphasis*", writer);
+            string html = writer.ToString();
+            Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
+            writer.GetStringBuilder().Length = 0;
         }
 
-        [Test]
-        public void TestToHtmlWithWriter()
+        writer = new StringWriter();
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseAdvancedExtensions()
+            .Build();
+
+        for (int i = 0; i < 5; i++)
+        {
+            _ = Markdown.ToHtml("This is a text with a https://link.tld/", writer, pipeline);
+            string html = writer.ToString();
+            Assert.AreEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
+            writer.GetStringBuilder().Length = 0;
+        }
+    }
+
+    [Test]
+    public void TestDocumentToHtmlWithWriter()
+    {
+        var writer = new StringWriter();
+
+        for (int i = 0; i < 5; i++)
+        {
+            MarkdownDocument document = Markdown.Parse("This is a text with some *emphasis*");
+            document.ToHtml(writer);
+            string html = writer.ToString();
+            Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
+            writer.GetStringBuilder().Length = 0;
+        }
+
+        writer = new StringWriter();
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseAdvancedExtensions()
+            .Build();
+
+        for (int i = 0; i < 5; i++)
+        {
+            MarkdownDocument document = Markdown.Parse("This is a text with a https://link.tld/", pipeline);
+            document.ToHtml(writer, pipeline);
+            string html = writer.ToString();
+            Assert.AreEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
+            writer.GetStringBuilder().Length = 0;
+        }
+    }
+
+    [Test]
+    public void TestConvert()
+    {
+        var writer = new StringWriter();
+        var renderer = new HtmlRenderer(writer);
+
+        for (int i = 0; i < 5; i++)
+        {
+            _ = Markdown.Convert("This is a text with some *emphasis*", renderer);
+            string html = writer.ToString();
+            Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
+            writer.GetStringBuilder().Length = 0;
+        }
+
+        writer = new StringWriter();
+        renderer = new HtmlRenderer(writer);
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseAdvancedExtensions()
+            .Build();
+
+        for (int i = 0; i < 5; i++)
+        {
+            _ = Markdown.Convert("This is a text with a https://link.tld/", renderer, pipeline);
+            string html = writer.ToString();
+            Assert.AreEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
+            writer.GetStringBuilder().Length = 0;
+        }
+    }
+
+    [Test]
+    public void TestParse()
+    {
+        const string markdown = "This is a text with some *emphasis*";
+
+        var pipeline = new MarkdownPipelineBuilder()
+            .UsePreciseSourceLocation()
+            .Build();
+
+        for (int i = 0; i < 5; i++)
+        {
+            MarkdownDocument document = Markdown.Parse(markdown, pipeline);
+
+            Assert.AreEqual(1, document.LineCount);
+            Assert.AreEqual(markdown.Length, document.Span.Length);
+            Assert.AreEqual(1, document.LineStartIndexes.Count);
+            Assert.AreEqual(0, document.LineStartIndexes[0]);
+
+            Assert.AreEqual(1, document.Count);
+            ParagraphBlock paragraph = document[0] as ParagraphBlock;
+            Assert.NotNull(paragraph);
+            Assert.AreEqual(markdown.Length, paragraph.Span.Length);
+            LiteralInline literal = paragraph.Inline.FirstChild as LiteralInline;
+            Assert.NotNull(literal);
+            Assert.AreEqual("This is a text with some ", literal.ToString());
+            EmphasisInline emphasis = literal.NextSibling as EmphasisInline;
+            Assert.NotNull(emphasis);
+            Assert.AreEqual("*emphasis*".Length, emphasis.Span.Length);
+            LiteralInline emphasisLiteral = emphasis.FirstChild as LiteralInline;
+            Assert.NotNull(emphasisLiteral);
+            Assert.AreEqual("emphasis", emphasisLiteral.ToString());
+            Assert.Null(emphasisLiteral.NextSibling);
+            Assert.Null(emphasis.NextSibling);
+        }
+    }
+
+    [Test]
+    public void TestNormalize()
+    {
+        for (int i = 0; i < 5; i++)
+        {
+            string normalized = Markdown.Normalize("Heading\n=======");
+            Assert.AreEqual("# Heading", normalized);
+        }
+    }
+
+    [Test]
+    public void TestNormalizeWithWriter()
+    {
+        for (int i = 0; i < 5; i++)
         {
             var writer = new StringWriter();
 
-            for (int i = 0; i < 5; i++)
-            {
-                _ = Markdown.ToHtml("This is a text with some *emphasis*", writer);
-                string html = writer.ToString();
-                Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
-                writer.GetStringBuilder().Length = 0;
-            }
-
-            writer = new StringWriter();
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseAdvancedExtensions()
-                .Build();
-
-            for (int i = 0; i < 5; i++)
-            {
-                _ = Markdown.ToHtml("This is a text with a https://link.tld/", writer, pipeline);
-                string html = writer.ToString();
-                Assert.AreEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
-                writer.GetStringBuilder().Length = 0;
-            }
+            _ = Markdown.Normalize("Heading\n=======", writer);
+            string normalized = writer.ToString();
+            Assert.AreEqual("# Heading", normalized);
         }
+    }
 
-        [Test]
-        public void TestDocumentToHtmlWithWriter()
+    [Test]
+    public void TestToPlainText()
+    {
+        for (int i = 0; i < 5; i++)
+        {
+            string plainText = Markdown.ToPlainText("*Hello*, [world](http://example.com)!");
+            Assert.AreEqual("Hello, world!\n", plainText);
+        }
+    }
+
+    [Test]
+    public void TestToPlainTextWithWriter()
+    {
+        for (int i = 0; i < 5; i++)
         {
             var writer = new StringWriter();
 
-            for (int i = 0; i < 5; i++)
-            {
-                MarkdownDocument document = Markdown.Parse("This is a text with some *emphasis*");
-                document.ToHtml(writer);
-                string html = writer.ToString();
-                Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
-                writer.GetStringBuilder().Length = 0;
-            }
-
-            writer = new StringWriter();
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseAdvancedExtensions()
-                .Build();
-
-            for (int i = 0; i < 5; i++)
-            {
-                MarkdownDocument document = Markdown.Parse("This is a text with a https://link.tld/", pipeline);
-                document.ToHtml(writer, pipeline);
-                string html = writer.ToString();
-                Assert.AreEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
-                writer.GetStringBuilder().Length = 0;
-            }
-        }
-
-        [Test]
-        public void TestConvert()
-        {
-            var writer = new StringWriter();
-            var renderer = new HtmlRenderer(writer);
-
-            for (int i = 0; i < 5; i++)
-            {
-                _ = Markdown.Convert("This is a text with some *emphasis*", renderer);
-                string html = writer.ToString();
-                Assert.AreEqual("<p>This is a text with some <em>emphasis</em></p>\n", html);
-                writer.GetStringBuilder().Length = 0;
-            }
-
-            writer = new StringWriter();
-            renderer = new HtmlRenderer(writer);
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseAdvancedExtensions()
-                .Build();
-
-            for (int i = 0; i < 5; i++)
-            {
-                _ = Markdown.Convert("This is a text with a https://link.tld/", renderer, pipeline);
-                string html = writer.ToString();
-                Assert.AreEqual("<p>This is a text with a <a href=\"https://link.tld/\">https://link.tld/</a></p>\n", html);
-                writer.GetStringBuilder().Length = 0;
-            }
-        }
-
-        [Test]
-        public void TestParse()
-        {
-            const string markdown = "This is a text with some *emphasis*";
-
-            var pipeline = new MarkdownPipelineBuilder()
-                .UsePreciseSourceLocation()
-                .Build();
-
-            for (int i = 0; i < 5; i++)
-            {
-                MarkdownDocument document = Markdown.Parse(markdown, pipeline);
-
-                Assert.AreEqual(1, document.LineCount);
-                Assert.AreEqual(markdown.Length, document.Span.Length);
-                Assert.AreEqual(1, document.LineStartIndexes.Count);
-                Assert.AreEqual(0, document.LineStartIndexes[0]);
-
-                Assert.AreEqual(1, document.Count);
-                ParagraphBlock paragraph = document[0] as ParagraphBlock;
-                Assert.NotNull(paragraph);
-                Assert.AreEqual(markdown.Length, paragraph.Span.Length);
-                LiteralInline literal = paragraph.Inline.FirstChild as LiteralInline;
-                Assert.NotNull(literal);
-                Assert.AreEqual("This is a text with some ", literal.ToString());
-                EmphasisInline emphasis = literal.NextSibling as EmphasisInline;
-                Assert.NotNull(emphasis);
-                Assert.AreEqual("*emphasis*".Length, emphasis.Span.Length);
-                LiteralInline emphasisLiteral = emphasis.FirstChild as LiteralInline;
-                Assert.NotNull(emphasisLiteral);
-                Assert.AreEqual("emphasis", emphasisLiteral.ToString());
-                Assert.Null(emphasisLiteral.NextSibling);
-                Assert.Null(emphasis.NextSibling);
-            }
-        }
-
-        [Test]
-        public void TestNormalize()
-        {
-            for (int i = 0; i < 5; i++)
-            {
-                string normalized = Markdown.Normalize("Heading\n=======");
-                Assert.AreEqual("# Heading", normalized);
-            }
-        }
-
-        [Test]
-        public void TestNormalizeWithWriter()
-        {
-            for (int i = 0; i < 5; i++)
-            {
-                var writer = new StringWriter();
-
-                _ = Markdown.Normalize("Heading\n=======", writer);
-                string normalized = writer.ToString();
-                Assert.AreEqual("# Heading", normalized);
-            }
-        }
-
-        [Test]
-        public void TestToPlainText()
-        {
-            for (int i = 0; i < 5; i++)
-            {
-                string plainText = Markdown.ToPlainText("*Hello*, [world](http://example.com)!");
-                Assert.AreEqual("Hello, world!\n", plainText);
-            }
-        }
-
-        [Test]
-        public void TestToPlainTextWithWriter()
-        {
-            for (int i = 0; i < 5; i++)
-            {
-                var writer = new StringWriter();
-
-                _ = Markdown.ToPlainText("*Hello*, [world](http://example.com)!", writer);
-                string plainText = writer.ToString();
-                Assert.AreEqual("Hello, world!\n", plainText);
-            }
+            _ = Markdown.ToPlainText("*Hello*, [world](http://example.com)!", writer);
+            string plainText = writer.ToString();
+            Assert.AreEqual("Hello, world!\n", plainText);
         }
     }
 }

src/Markdig.Tests/TestMediaLinks.cs

@@ -1,104 +1,113 @@
-using Markdig.Extensions.MediaLinks;
-using NUnit.Framework;
-using System;
 using System.Text.RegularExpressions;
 
-namespace Markdig.Tests
+using Markdig.Extensions.MediaLinks;
+
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestMediaLinks
 {
-    [TestFixture]
-    public class TestMediaLinks
+    private MarkdownPipeline GetPipeline(MediaOptions options = null)
     {
-        private MarkdownPipeline GetPipeline(MediaOptions options = null)
+        return new MarkdownPipelineBuilder()
+             .UseMediaLinks(options)
+             .Build();
+    }
+
+    private MarkdownPipeline GetPipelineWithBootstrap(MediaOptions options = null)
+    {
+        return new MarkdownPipelineBuilder()
+            .UseBootstrap()
+            .UseMediaLinks(options)
+            .Build();
+    }
+
+    [Test]
+    [TestCase("![static mp4](https://sample.com/video.mp4)", "<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"https://sample.com/video.mp4\"></source></video></p>\n")]
+    [TestCase("![static mp4](//sample.com/video.mp4)", "<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"//sample.com/video.mp4\"></source></video></p>\n")]
+    [TestCase(@"![youtube short](https://www.youtube.com/shorts/6BUptHVuvyI?feature=share)", "<p><iframe src=\"https://www.youtube.com/embed/6BUptHVuvyI\" class=\"youtubeshort\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
+    [TestCase(@"![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" class=\"youtube\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
+    [TestCase("![yandex.ru](https://music.yandex.ru/album/411845/track/4402274)", "<p><iframe src=\"https://music.yandex.ru/iframe/#track/4402274/411845/\" class=\"yandex\" width=\"500\" height=\"281\" frameborder=\"0\"></iframe></p>\n")]
+    [TestCase("![vimeo](https://vimeo.com/8607834)", "<p><iframe src=\"https://player.vimeo.com/video/8607834\" class=\"vimeo\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
+    [TestCase("![ok.ru](https://ok.ru/video/26870090463)", "<p><iframe src=\"https://ok.ru/videoembed/26870090463\" class=\"odnoklassniki\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
+    [TestCase("![ok.ru](//ok.ru/video/26870090463)", "<p><iframe src=\"https://ok.ru/videoembed/26870090463\" class=\"odnoklassniki\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
+    public void TestBuiltInHosts(string markdown, string expected)
+    {
+        string html = Markdown.ToHtml(markdown, GetPipeline());
+        Assert.AreEqual(expected, html);
+    }
+
+    [TestCase("![static video relative path](./video.mp4)",
+        "<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"./video.mp4\"></source></video></p>\n")]
+    [TestCase("![static audio relative path](./audio.mp3)",
+        "<p><audio width=\"500\" controls=\"\"><source type=\"audio/mpeg\" src=\"./audio.mp3\"></source></audio></p>\n")]
+    public void TestBuiltInHostsWithRelativePaths(string markdown, string expected)
+    {
+        string html = Markdown.ToHtml(markdown, GetPipeline());
+        Assert.AreEqual(expected, html);
+    }
+    
+    private class TestHostProvider : IHostProvider
+    {
+        public string Class { get; } = "regex";
+        public bool AllowFullScreen { get; }
+
+        public bool TryHandle(Uri mediaUri, bool isSchemaRelative, out string iframeUrl)
         {
-            return new MarkdownPipelineBuilder()
-                 .UseMediaLinks(options)
-                 .Build();
+            iframeUrl = null;
+            var uri = isSchemaRelative ? "//" + mediaUri.GetComponents(UriComponents.AbsoluteUri & ~UriComponents.Scheme, UriFormat.UriEscaped) : mediaUri.ToString();
+            if (!matcher.IsMatch(uri))
+                return false;
+            iframeUrl = matcher.Replace(uri, replacement);
+            return true;
         }
 
-        private MarkdownPipeline GetPipelineWithBootstrap(MediaOptions options = null)
+        private Regex matcher;
+        private string replacement;
+
+        public TestHostProvider(string provider, string replace)
         {
-            return new MarkdownPipelineBuilder()
-                .UseBootstrap()
-                .UseMediaLinks(options)
-                .Build();
-        }
-
-        [Test]
-        [TestCase("![static mp4](https://sample.com/video.mp4)", "<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"https://sample.com/video.mp4\"></source></video></p>\n")]
-        [TestCase("![static mp4](//sample.com/video.mp4)", "<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"//sample.com/video.mp4\"></source></video></p>\n")]
-        [TestCase(@"![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" class=\"youtube\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
-        [TestCase("![yandex.ru](https://music.yandex.ru/album/411845/track/4402274)", "<p><iframe src=\"https://music.yandex.ru/iframe/#track/4402274/411845/\" class=\"yandex\" width=\"500\" height=\"281\" frameborder=\"0\"></iframe></p>\n")]
-        [TestCase("![vimeo](https://vimeo.com/8607834)", "<p><iframe src=\"https://player.vimeo.com/video/8607834\" class=\"vimeo\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
-        [TestCase("![ok.ru](https://ok.ru/video/26870090463)", "<p><iframe src=\"https://ok.ru/videoembed/26870090463\" class=\"odnoklassniki\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
-        [TestCase("![ok.ru](//ok.ru/video/26870090463)", "<p><iframe src=\"https://ok.ru/videoembed/26870090463\" class=\"odnoklassniki\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
-        public void TestBuiltInHosts(string markdown, string expected)
-        {
-            string html = Markdown.ToHtml(markdown, GetPipeline());
-            Assert.AreEqual(html, expected);
-        }
-
-        private class TestHostProvider : IHostProvider
-        {
-            public string Class { get; } = "regex";
-            public bool AllowFullScreen { get; }
-
-            public bool TryHandle(Uri mediaUri, bool isSchemaRelative, out string iframeUrl)
-            {
-                iframeUrl = null;
-                var uri = isSchemaRelative ? "//" + mediaUri.GetComponents(UriComponents.AbsoluteUri & ~UriComponents.Scheme, UriFormat.UriEscaped) : mediaUri.ToString();
-                if (!matcher.IsMatch(uri))
-                    return false;
-                iframeUrl = matcher.Replace(uri, replacement);
-                return true;
-            }
-
-            private Regex matcher;
-            private string replacement;
-
-            public TestHostProvider(string provider, string replace)
-            {
-                matcher = new Regex(provider);
-                replacement = replace;
-            }
-        }
-
-        [Test]
-        [TestCase("![p1](https://sample.com/video.mp4)", "<p><iframe src=\"https://example.com/video.mp4\" class=\"regex\" width=\"500\" height=\"281\" frameborder=\"0\"></iframe></p>\n", @"^https?://sample.com/(.+)$", @"https://example.com/$1")]
-        [TestCase("![p1](//sample.com/video.mp4)", "<p><iframe src=\"https://example.com/video.mp4\" class=\"regex\" width=\"500\" height=\"281\" frameborder=\"0\"></iframe></p>\n", @"^//sample.com/(.+)$", @"https://example.com/$1")]
-        [TestCase("![p1](https://sample.com/video.mp4)", "<p><iframe src=\"https://example.com/video.mp4?token=aaabbb\" class=\"regex\" width=\"500\" height=\"281\" frameborder=\"0\"></iframe></p>\n", @"^https?://sample.com/(.+)$", @"https://example.com/$1?token=aaabbb")]
-        public void TestCustomHostProvider(string markdown, string expected, string provider, string replace)
-        {
-            string html = Markdown.ToHtml(markdown, GetPipeline(new MediaOptions
-            {
-                Hosts =
-                {
-                    new TestHostProvider(provider, replace),
-                }
-            }));
-            Assert.AreEqual(html, expected);
-        }
-
-        [Test]
-        [TestCase("![static mp4](//sample.com/video.mp4)", "<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"//sample.com/video.mp4\"></source></video></p>\n", "")]
-        [TestCase(@"![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" class=\"youtube\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n", "")]
-        [TestCase("![static mp4](//sample.com/video.mp4)", "<p><video class=\"k\" width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"//sample.com/video.mp4\"></source></video></p>\n", "k")]
-        [TestCase(@"![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" class=\"k youtube\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n", "k")]
-        public void TestCustomClass(string markdown, string expected, string klass)
-        {
-            string html = Markdown.ToHtml(markdown, GetPipeline(new MediaOptions
-            {
-                Class = klass,
-            }));
-            Assert.AreEqual(html, expected);
-        }
-
-        [Test]
-        [TestCase("![static mp4](//sample.com/video.mp4)", "<p><video class=\"img-fluid\" width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"//sample.com/video.mp4\"></source></video></p>\n")]
-        [TestCase(@"![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" class=\"img-fluid youtube\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
-        public void TestWithBootstrap(string markdown, string expected)
-        {
-            string html = Markdown.ToHtml(markdown, GetPipelineWithBootstrap());
-            Assert.AreEqual(html, expected);
+            matcher = new Regex(provider);
+            replacement = replace;
         }
     }
+
+    [Test]
+    [TestCase("![p1](https://sample.com/video.mp4)", "<p><iframe src=\"https://example.com/video.mp4\" class=\"regex\" width=\"500\" height=\"281\" frameborder=\"0\"></iframe></p>\n", @"^https?://sample.com/(.+)$", @"https://example.com/$1")]
+    [TestCase("![p1](//sample.com/video.mp4)", "<p><iframe src=\"https://example.com/video.mp4\" class=\"regex\" width=\"500\" height=\"281\" frameborder=\"0\"></iframe></p>\n", @"^//sample.com/(.+)$", @"https://example.com/$1")]
+    [TestCase("![p1](https://sample.com/video.mp4)", "<p><iframe src=\"https://example.com/video.mp4?token=aaabbb\" class=\"regex\" width=\"500\" height=\"281\" frameborder=\"0\"></iframe></p>\n", @"^https?://sample.com/(.+)$", @"https://example.com/$1?token=aaabbb")]
+    public void TestCustomHostProvider(string markdown, string expected, string provider, string replace)
+    {
+        string html = Markdown.ToHtml(markdown, GetPipeline(new MediaOptions
+        {
+            Hosts =
+            {
+                new TestHostProvider(provider, replace),
+            }
+        }));
+        Assert.AreEqual(html, expected);
+    }
+
+    [Test]
+    [TestCase("![static mp4](//sample.com/video.mp4)", "<p><video width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"//sample.com/video.mp4\"></source></video></p>\n", "")]
+    [TestCase(@"![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" class=\"youtube\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n", "")]
+    [TestCase("![static mp4](//sample.com/video.mp4)", "<p><video class=\"k\" width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"//sample.com/video.mp4\"></source></video></p>\n", "k")]
+    [TestCase(@"![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" class=\"k youtube\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n", "k")]
+    public void TestCustomClass(string markdown, string expected, string klass)
+    {
+        string html = Markdown.ToHtml(markdown, GetPipeline(new MediaOptions
+        {
+            Class = klass,
+        }));
+        Assert.AreEqual(html, expected);
+    }
+
+    [Test]
+    [TestCase("![static mp4](//sample.com/video.mp4)", "<p><video class=\"img-fluid\" width=\"500\" height=\"281\" controls=\"\"><source type=\"video/mp4\" src=\"//sample.com/video.mp4\"></source></video></p>\n")]
+    [TestCase(@"![youtube.com](https://www.youtube.com/watch?v=mswPy5bt3TQ)", "<p><iframe src=\"https://www.youtube.com/embed/mswPy5bt3TQ\" class=\"img-fluid youtube\" width=\"500\" height=\"281\" frameborder=\"0\" allowfullscreen=\"\"></iframe></p>\n")]
+    public void TestWithBootstrap(string markdown, string expected)
+    {
+        string html = Markdown.ToHtml(markdown, GetPipelineWithBootstrap());
+        Assert.AreEqual(html, expected);
+    }
 }

src/Markdig.Tests/TestNewLine.cs

@@ -1,31 +1,28 @@
-using System.Linq;
 using Markdig.Syntax;
 using Markdig.Syntax.Inlines;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestNewLine
 {
-    [TestFixture]
-    public class TestNewLine
+    [TestCase("a  \nb", "<p>a<br />\nb</p>\n")]
+    [TestCase("a\\\nb", "<p>a<br />\nb</p>\n")]
+    [TestCase("a `b\nc`", "<p>a <code>b c</code></p>\n")]
+    [TestCase("# Text A\nText B\n\n## Text C", "<h1>Text A</h1>\n<p>Text B</p>\n<h2>Text C</h2>\n")]
+    public void Test(string value, string expectedHtml)
     {
-        [TestCase("a  \nb", "<p>a<br />\nb</p>\n")]
-        [TestCase("a\\\nb", "<p>a<br />\nb</p>\n")]
-        [TestCase("a `b\nc`", "<p>a <code>b c</code></p>\n")]
-        [TestCase("# Text A\nText B\n\n## Text C", "<h1>Text A</h1>\n<p>Text B</p>\n<h2>Text C</h2>\n")]
-        public void Test(string value, string expectedHtml)
-        {
-            Assert.AreEqual(expectedHtml, Markdown.ToHtml(value));
-            Assert.AreEqual(expectedHtml, Markdown.ToHtml(value.Replace("\n", "\r\n")));
-        }
+        Assert.AreEqual(expectedHtml, Markdown.ToHtml(value));
+        Assert.AreEqual(expectedHtml, Markdown.ToHtml(value.Replace("\n", "\r\n")));
+    }
 
-        [Test()]
-        public void TestEscapeLineBreak()
-        {
-            var input = "test\\\r\ntest1\r\n";
-            var doc = Markdown.Parse(input);
-            var inlines = doc.Descendants<LineBreakInline>().ToList();
-            Assert.AreEqual(1, inlines.Count, "Invalid number of LineBreakInline");
-            Assert.True(inlines[0].IsBackslash);
-        }
+    [Test()]
+    public void TestEscapeLineBreak()
+    {
+        var input = "test\\\r\ntest1\r\n";
+        var doc = Markdown.Parse(input);
+        var inlines = doc.Descendants<LineBreakInline>().ToList();
+        Assert.AreEqual(1, inlines.Count, "Invalid number of LineBreakInline");
+        Assert.True(inlines[0].IsBackslash);
     }
 }

src/Markdig.Tests/TestNormalize.cs

@@ -2,180 +2,187 @@
 // This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
 
-using System;
-using NUnit.Framework;
+using Markdig.Helpers;
+using Markdig.Renderers.Normalize;
 using Markdig.Syntax;
 using Markdig.Syntax.Inlines;
-using System.IO;
-using Markdig.Renderers.Normalize;
-using Markdig.Helpers;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestNormalize
 {
-    [TestFixture]
-    public class TestNormalize
+    [Test]
+    public void SyntaxCodeBlock()
     {
-        [Test]
-        public void SyntaxCodeBlock()
+        AssertSyntax("````csharp\npublic void HelloWorld()\n{\n}\n````", new FencedCodeBlock(null)
         {
-            AssertSyntax("````csharp\npublic void HelloWorld()\n{\n}\n````", new FencedCodeBlock(null)
+            FencedChar = '`',
+            OpeningFencedCharCount = 4,
+            ClosingFencedCharCount = 4,
+            Info = "csharp",
+            Lines = new StringLineGroup(4)
             {
-                FencedChar = '`',
-                OpeningFencedCharCount = 4,
-                ClosingFencedCharCount = 4,
-                Info = "csharp",
-                Lines = new StringLineGroup(4)
-                {
-                    new StringSlice("public void HelloWorld()"),
-                    new StringSlice("{"),
-                    new StringSlice("}"),
-                }
-            });
+                new StringSlice("public void HelloWorld()"),
+                new StringSlice("{"),
+                new StringSlice("}"),
+            }
+        });
 
-            AssertSyntax("    public void HelloWorld()\n    {\n    }", new CodeBlock(null)
+        AssertSyntax("    public void HelloWorld()\n    {\n    }", new CodeBlock(null)
+        {
+            Lines = new StringLineGroup(4)
             {
-                Lines = new StringLineGroup(4)
-                {
-                    new StringSlice("public void HelloWorld()"),
-                    new StringSlice("{"),
-                    new StringSlice("}"),
-                }
-            });
-        }
+                new StringSlice("public void HelloWorld()"),
+                new StringSlice("{"),
+                new StringSlice("}"),
+            }
+        });
+    }
 
-        [Test]
-        public void SyntaxHeadline()
+    [Test]
+    public void SyntaxHeadline()
+    {
+        AssertSyntax("## Headline", new HeadingBlock(null)
         {
-            AssertSyntax("## Headline", new HeadingBlock(null)
-            {
-                HeaderChar = '#',
-                Level = 2,
-                Inline = new ContainerInline().AppendChild(new LiteralInline("Headline")),
-            });
-        }
+            HeaderChar = '#',
+            Level = 2,
+            Inline = new ContainerInline().AppendChild(new LiteralInline("Headline")),
+        });
+    }
 
-        [Test]
-        public void SyntaxParagraph()
+    [Test]
+    public void SyntaxHeadlineLevel7()
+    {
+        AssertSyntax("####### Headline", new HeadingBlock(null) {
+            HeaderChar = '#',
+            Level = 7,
+            Inline = new ContainerInline().AppendChild(new LiteralInline("Headline")),
+        });
+    }
+
+    [Test]
+    public void SyntaxParagraph()
+    {
+        AssertSyntax("This is a normal paragraph", new ParagraphBlock()
         {
-            AssertSyntax("This is a normal paragraph", new ParagraphBlock()
-            {
-                Inline = new ContainerInline()
-                    .AppendChild(new LiteralInline("This is a normal paragraph")),
-            });
+            Inline = new ContainerInline()
+                .AppendChild(new LiteralInline("This is a normal paragraph")),
+        });
 
-            AssertSyntax("This is a\nnormal\nparagraph", new ParagraphBlock()
-            {
-                Inline = new ContainerInline()
-                    .AppendChild(new LiteralInline("This is a"))
-                    .AppendChild(new LineBreakInline())
-                    .AppendChild(new LiteralInline("normal"))
-                    .AppendChild(new LineBreakInline())
-                    .AppendChild(new LiteralInline("paragraph")),
-            });
-        }
-
-        [Test]
-        public void CodeBlock()
+        AssertSyntax("This is a\nnormal\nparagraph", new ParagraphBlock()
         {
-            AssertNormalizeNoTrim("    public void HelloWorld();\n    {\n    }");
-            AssertNormalizeNoTrim("    public void HelloWorld();\n    {\n    }\n\ntext after two newlines");
-            AssertNormalizeNoTrim("````\npublic void HelloWorld();\n{\n}\n````\n\ntext after two newlines");
-            AssertNormalizeNoTrim("````csharp\npublic void HelloWorld();\n{\n}\n````");
-            AssertNormalizeNoTrim("````csharp hideNewKeyword=true\npublic void HelloWorld();\n{\n}\n````");
-        }
+            Inline = new ContainerInline()
+                .AppendChild(new LiteralInline("This is a"))
+                .AppendChild(new LineBreakInline())
+                .AppendChild(new LiteralInline("normal"))
+                .AppendChild(new LineBreakInline())
+                .AppendChild(new LiteralInline("paragraph")),
+        });
+    }
 
-        [Test]
-        public void Heading()
-        {
-            AssertNormalizeNoTrim("# Heading");
-            AssertNormalizeNoTrim("## Heading");
-            AssertNormalizeNoTrim("### Heading");
-            AssertNormalizeNoTrim("#### Heading");
-            AssertNormalizeNoTrim("##### Heading");
-            AssertNormalizeNoTrim("###### Heading");
-            AssertNormalizeNoTrim("###### Heading\n\ntext after two newlines");
-            AssertNormalizeNoTrim("# Heading\nAnd Text1\n\nAndText2", options: new NormalizeOptions() { EmptyLineAfterHeading = false });
+    [Test]
+    public void CodeBlock()
+    {
+        AssertNormalizeNoTrim("    public void HelloWorld();\n    {\n    }");
+        AssertNormalizeNoTrim("    public void HelloWorld();\n    {\n    }\n\ntext after two newlines");
+        AssertNormalizeNoTrim("````\npublic void HelloWorld();\n{\n}\n````\n\ntext after two newlines");
+        AssertNormalizeNoTrim("````csharp\npublic void HelloWorld();\n{\n}\n````");
+        AssertNormalizeNoTrim("````csharp hideNewKeyword=true\npublic void HelloWorld();\n{\n}\n````");
+    }
 
-            AssertNormalizeNoTrim("Heading\n=======\n\ntext after two newlines", "# Heading\n\ntext after two newlines");
-        }
+    [Test]
+    public void Heading()
+    {
+        AssertNormalizeNoTrim("# Heading");
+        AssertNormalizeNoTrim("## Heading");
+        AssertNormalizeNoTrim("### Heading");
+        AssertNormalizeNoTrim("#### Heading");
+        AssertNormalizeNoTrim("##### Heading");
+        AssertNormalizeNoTrim("###### Heading");
+        AssertNormalizeNoTrim("###### Heading\n\ntext after two newlines");
+        AssertNormalizeNoTrim("# Heading\nAnd Text1\n\nAndText2", options: new NormalizeOptions() { EmptyLineAfterHeading = false });
 
-        [Test]
-        public void Backslash()
-        {
-            AssertNormalizeNoTrim("This is a hardline  \nAnd this is another hardline\\\nThis is standard newline");
-            AssertNormalizeNoTrim("This is a line\nWith another line\nAnd a last line");
-        }
+        AssertNormalizeNoTrim("Heading\n=======\n\ntext after two newlines", "# Heading\n\ntext after two newlines");
+    }
 
-        [Test]
-        public void HtmlBlock()
-        {
-            /*AssertNormalizeNoTrim(@"<div id=""foo"" class=""bar
-  baz"">
+    [Test]
+    public void Backslash()
+    {
+        AssertNormalizeNoTrim("This is a hardline  \nAnd this is another hardline\\\nThis is standard newline");
+        AssertNormalizeNoTrim("This is a line\nWith another line\nAnd a last line");
+    }
+
+    [Test]
+    public void HtmlBlock()
+    {
+        /*AssertNormalizeNoTrim(@"<div id=""foo"" class=""bar
+baz"">
 </ div >");*/ // TODO: Bug: Throws Exception during emit
-        }
+    }
 
-        [Test]
-        public void Paragraph()
-        {
-            AssertNormalizeNoTrim("This is a plain paragraph");
-            AssertNormalizeNoTrim(@"This
+    [Test]
+    public void Paragraph()
+    {
+        AssertNormalizeNoTrim("This is a plain paragraph");
+        AssertNormalizeNoTrim(@"This
 is
 a
 plain
 paragraph");
-        }
+    }
 
-        [Test]
-        public void ParagraphMulti()
-        {
-            AssertNormalizeNoTrim(@"line1
+    [Test]
+    public void ParagraphMulti()
+    {
+        AssertNormalizeNoTrim(@"line1
 
 line2
 
 line3");
-        }
+    }
 
-        [Test]
-        public void ListUnordered()
-        {
-            AssertNormalizeNoTrim(@"- a
+    [Test]
+    public void ListUnordered()
+    {
+        AssertNormalizeNoTrim(@"- a
 - b
 - c");
-        }
+    }
 
-        [Test]
-        public void ListUnorderedLoose()
-        {
-            AssertNormalizeNoTrim(@"- a
+    [Test]
+    public void ListUnorderedLoose()
+    {
+        AssertNormalizeNoTrim(@"- a
 
 - b
 
 - c");
-        }
+    }
 
-        [Test]
-        public void ListOrderedLooseAndCodeBlock()
-        {
-            AssertNormalizeNoTrim(@"1. ```
+    [Test]
+    public void ListOrderedLooseAndCodeBlock()
+    {
+        AssertNormalizeNoTrim(@"1. ```
    foo
    ```
    
    bar");
-        }
+    }
 
-        [Test, Ignore("Not sure this is the correct normalize for this one. Need to check the specs")]
-        public void ListUnorderedLooseTop()
-        {
-            AssertNormalizeNoTrim(@"* foo
+    [Test, Ignore("Not sure this is the correct normalize for this one. Need to check the specs")]
+    public void ListUnorderedLooseTop()
+    {
+        AssertNormalizeNoTrim(@"* foo
   * bar
   
   baz", options: new NormalizeOptions() { ListItemCharacter = '*' });
-        }
+    }
 
-        [Test]
-        public void ListUnorderedLooseMultiParagraph()
-        {
-            AssertNormalizeNoTrim(
+    [Test]
+    public void ListUnorderedLooseMultiParagraph()
+    {
+        AssertNormalizeNoTrim(
 @"- a
   
   And another paragraph a
@@ -185,22 +192,22 @@ line3");
   And another paragraph b
 
 - c");
-        }
+    }
 
 
-        [Test]
-        public void ListOrdered()
-        {
-            AssertNormalizeNoTrim(@"1. a
+    [Test]
+    public void ListOrdered()
+    {
+        AssertNormalizeNoTrim(@"1. a
 2. b
 3. c");
-        }
+    }
 
 
-        [Test]
-        public void ListOrderedAndIntended()
-        {
-            AssertNormalizeNoTrim(@"1. a
+    [Test]
+    public void ListOrderedAndIntended()
+    {
+        AssertNormalizeNoTrim(@"1. a
 2. b
    - foo
    - bar
@@ -218,169 +225,169 @@ line3");
     - Bar
 11. c
 12. c");
-        }
+    }
 
-        [Test]
-        public void HeaderAndParagraph()
-        {
-            AssertNormalizeNoTrim(@"# heading
+    [Test]
+    public void HeaderAndParagraph()
+    {
+        AssertNormalizeNoTrim(@"# heading
 
 paragraph
 
 paragraph2 without newlines");
-        }
+    }
 
 
-        [Test]
-        public void QuoteBlock()
-        {
-            AssertNormalizeNoTrim(@"> test1
+    [Test]
+    public void QuoteBlock()
+    {
+        AssertNormalizeNoTrim(@"> test1
 > 
 > test2");
 
-            AssertNormalizeNoTrim(@"> test1
+        AssertNormalizeNoTrim(@"> test1
 This is a continuation
 > test2",
-                @"> test1
+            @"> test1
 > This is a continuation
 > test2"
 );
 
-            AssertNormalizeNoTrim(@"> test1
+        AssertNormalizeNoTrim(@"> test1
 > -foobar
 
 asdf
 
 > test2
 > -foobar sen.");
-        }
+    }
 
-        [Test]
-        public void ThematicBreak()
-        {
-            AssertNormalizeNoTrim("***\n");
+    [Test]
+    public void ThematicBreak()
+    {
+        AssertNormalizeNoTrim("***\n");
 
-            AssertNormalizeNoTrim("* * *\n", "***\n");
-        }
+        AssertNormalizeNoTrim("* * *\n", "***\n");
+    }
 
-        [Test]
-        public void AutolinkInline()
-        {
-            AssertNormalizeNoTrim("This has a <auto.link.com>");
-        }
+    [Test]
+    public void AutolinkInline()
+    {
+        AssertNormalizeNoTrim("This has a <auto.link.com>");
+    }
 
-        [Test]
-        public void CodeInline()
-        {
-            AssertNormalizeNoTrim("This has a ` ` in it");
-            AssertNormalizeNoTrim("This has a `HelloWorld()` in it");
-            AssertNormalizeNoTrim(@"This has a ``Hello`World()`` in it");
-            AssertNormalizeNoTrim(@"This has a ``` Hello`World() ``` in it", @"This has a ``Hello`World()`` in it");
-            AssertNormalizeNoTrim(@"This has a ``Hello`World()` `` in it");
-            AssertNormalizeNoTrim(@"This has a ```` ``Hello```World()` ```` in it");
-            AssertNormalizeNoTrim(@"This has a `` `Hello`World()`` in it");
-            AssertNormalizeNoTrim(@"This has a ``` ``Hello`World()` ``` in it");
-        }
+    [Test]
+    public void CodeInline()
+    {
+        AssertNormalizeNoTrim("This has a ` ` in it");
+        AssertNormalizeNoTrim("This has a `HelloWorld()` in it");
+        AssertNormalizeNoTrim(@"This has a ``Hello`World()`` in it");
+        AssertNormalizeNoTrim(@"This has a ``` Hello`World() ``` in it", @"This has a ``Hello`World()`` in it");
+        AssertNormalizeNoTrim(@"This has a ``Hello`World()` `` in it");
+        AssertNormalizeNoTrim(@"This has a ```` ``Hello```World()` ```` in it");
+        AssertNormalizeNoTrim(@"This has a `` `Hello`World()`` in it");
+        AssertNormalizeNoTrim(@"This has a ``` ``Hello`World()` ``` in it");
+    }
 
-        [Test]
-        public void EmphasisInline()
-        {
-            AssertNormalizeNoTrim("This is a plain **paragraph**");
-            AssertNormalizeNoTrim("This is a plain *paragraph*");
-            AssertNormalizeNoTrim("This is a plain _paragraph_");
-            AssertNormalizeNoTrim("This is a plain __paragraph__");
-            AssertNormalizeNoTrim("This is a pl*ai*n **paragraph**");
-        }
+    [Test]
+    public void EmphasisInline()
+    {
+        AssertNormalizeNoTrim("This is a plain **paragraph**");
+        AssertNormalizeNoTrim("This is a plain *paragraph*");
+        AssertNormalizeNoTrim("This is a plain _paragraph_");
+        AssertNormalizeNoTrim("This is a plain __paragraph__");
+        AssertNormalizeNoTrim("This is a pl*ai*n **paragraph**");
+    }
 
-        [Test]
-        public void LineBreakInline()
-        {
-            AssertNormalizeNoTrim("normal\nline break");
-            AssertNormalizeNoTrim("hard  \nline break");
-            AssertNormalizeNoTrim("This is a hardline  \nAnd this is another hardline\\\nThis is standard newline");
-            AssertNormalizeNoTrim("This is a line\nWith another line\nAnd a last line");
-        }
+    [Test]
+    public void LineBreakInline()
+    {
+        AssertNormalizeNoTrim("normal\nline break");
+        AssertNormalizeNoTrim("hard  \nline break");
+        AssertNormalizeNoTrim("This is a hardline  \nAnd this is another hardline\\\nThis is standard newline");
+        AssertNormalizeNoTrim("This is a line\nWith another line\nAnd a last line");
+    }
 
-        [Test]
-        public void LinkInline()
-        {
-            AssertNormalizeNoTrim("This is a [link](http://company.com)");
-            AssertNormalizeNoTrim("This is an ![image](http://company.com)");
+    [Test]
+    public void LinkInline()
+    {
+        AssertNormalizeNoTrim("This is a [link](http://company.com)");
+        AssertNormalizeNoTrim("This is an ![image](http://company.com)");
 
-            AssertNormalizeNoTrim(@"This is a [link](http://company.com ""Crazy Company"")");
-            AssertNormalizeNoTrim(@"This is a [link](http://company.com ""Crazy \"" Company"")");
-        }
+        AssertNormalizeNoTrim(@"This is a [link](http://company.com ""Crazy Company"")");
+        AssertNormalizeNoTrim(@"This is a [link](http://company.com ""Crazy \"" Company"")");
+    }
 
-        [Test]
-        public void LinkReferenceDefinition()
-        {
-            // Full link
-            AssertNormalizeNoTrim("This is a [link][MyLink]\n\n[MyLink]: http://company.com");
+    [Test]
+    public void LinkReferenceDefinition()
+    {
+        // Full link
+        AssertNormalizeNoTrim("This is a [link][MyLink]\n\n[MyLink]: http://company.com");
 
-            AssertNormalizeNoTrim("[MyLink]: http://company.com\nThis is a [link][MyLink]",
-                "This is a [link][MyLink]\n\n[MyLink]: http://company.com");
+        AssertNormalizeNoTrim("[MyLink]: http://company.com\nThis is a [link][MyLink]",
+            "This is a [link][MyLink]\n\n[MyLink]: http://company.com");
 
-            AssertNormalizeNoTrim("This is a [link][MyLink] a normal link [link](http://google.com) and another def link [link2][MyLink2]\n\n[MyLink]: http://company.com\n[MyLink2]: http://company2.com");
+        AssertNormalizeNoTrim("This is a [link][MyLink] a normal link [link](http://google.com) and another def link [link2][MyLink2]\n\n[MyLink]: http://company.com\n[MyLink2]: http://company2.com");
 
-            // Collapsed link
-            AssertNormalizeNoTrim("This is a [link][]\n\n[link]: http://company.com");
+        // Collapsed link
+        AssertNormalizeNoTrim("This is a [link][]\n\n[link]: http://company.com");
 
-            // Shortcut link
-            AssertNormalizeNoTrim("This is a [link]\n\n[link]: http://company.com");
-        }
+        // Shortcut link
+        AssertNormalizeNoTrim("This is a [link]\n\n[link]: http://company.com");
+    }
 
-        [Test]
-        public void EscapeInline()
-        {
-            AssertNormalizeNoTrim("This is an escape \\* with another \\[");
-        }
+    [Test]
+    public void EscapeInline()
+    {
+        AssertNormalizeNoTrim("This is an escape \\* with another \\[");
+    }
 
-        [Test]
-        public void HtmlEntityInline()
-        {
-            AssertNormalizeNoTrim("This is a &auml; blank");
-        }
+    [Test]
+    public void HtmlEntityInline()
+    {
+        AssertNormalizeNoTrim("This is a &auml; blank");
+    }
 
-        [Test]
-        public void HtmlInline()
-        {
-            AssertNormalizeNoTrim("foo <hr/> bar");
-            AssertNormalizeNoTrim(@"foo <hr foo=""bar""/> bar");
-        }
+    [Test]
+    public void HtmlInline()
+    {
+        AssertNormalizeNoTrim("foo <hr/> bar");
+        AssertNormalizeNoTrim(@"foo <hr foo=""bar""/> bar");
+    }
 
 
-        [Test]
-        public void SpaceBetweenNodes()
-        {
-            AssertNormalizeNoTrim("# Hello World\nFoobar is a better bar.",
-                                  "# Hello World\n\nFoobar is a better bar.");
-        }
+    [Test]
+    public void SpaceBetweenNodes()
+    {
+        AssertNormalizeNoTrim("# Hello World\nFoobar is a better bar.",
+                              "# Hello World\n\nFoobar is a better bar.");
+    }
 
-        [Test]
-        public void SpaceBetweenNodesEvenForHeadlines()
-        {
-            AssertNormalizeNoTrim("# Hello World\n## Chapter 1\nFoobar is a better bar.",
-                                  "# Hello World\n\n## Chapter 1\n\nFoobar is a better bar.");
-        }
+    [Test]
+    public void SpaceBetweenNodesEvenForHeadlines()
+    {
+        AssertNormalizeNoTrim("# Hello World\n## Chapter 1\nFoobar is a better bar.",
+                              "# Hello World\n\n## Chapter 1\n\nFoobar is a better bar.");
+    }
 
-        [Test]
-        public void SpaceRemoveAtStartAndEnd()
-        {
-            AssertNormalizeNoTrim("\n\n# Hello World\n## Chapter 1\nFoobar is a better bar.\n\n",
-                                  "# Hello World\n\n## Chapter 1\n\nFoobar is a better bar.");
-        }
+    [Test]
+    public void SpaceRemoveAtStartAndEnd()
+    {
+        AssertNormalizeNoTrim("\n\n# Hello World\n## Chapter 1\nFoobar is a better bar.\n\n",
+                              "# Hello World\n\n## Chapter 1\n\nFoobar is a better bar.");
+    }
 
-        [Test]
-        public void SpaceShortenBetweenNodes()
-        {
-            AssertNormalizeNoTrim("# Hello World\n\n\n\nFoobar is a better bar.",
-                                  "# Hello World\n\nFoobar is a better bar.");
-        }
+    [Test]
+    public void SpaceShortenBetweenNodes()
+    {
+        AssertNormalizeNoTrim("# Hello World\n\n\n\nFoobar is a better bar.",
+                              "# Hello World\n\nFoobar is a better bar.");
+    }
 
-        [Test]
-        public void BiggerSample()
-        {
-            var input = @"# Heading 1
+    [Test]
+    public void BiggerSample()
+    {
+        var input = @"# Heading 1
 
 This is a paragraph
 
@@ -400,100 +407,99 @@ This is a code block
     line 2 of indented
 
 This is a last line";
-            AssertNormalizeNoTrim(input);
-        }
+        AssertNormalizeNoTrim(input);
+    }
 
-        [Test]
-        public void TaskLists()
+    [Test]
+    public void TaskLists()
+    {
+        AssertNormalizeNoTrim("- [X] This is done");
+        AssertNormalizeNoTrim("- [x] This is done",
+                              "- [X] This is done");
+        AssertNormalizeNoTrim("- [ ] This is not done");
+
+        // ignore
+        AssertNormalizeNoTrim("[x] This is not a task list");
+        AssertNormalizeNoTrim("[ ] This is not a task list");
+    }
+
+    [Test]
+    public void JiraLinks()
+    {
+        AssertNormalizeNoTrim("FOO-1234");
+        AssertNormalizeNoTrim("AB-1");
+
+        AssertNormalizeNoTrim("**Hello World AB-1**");
+    }
+
+    [Test]
+    public void AutoLinks()
+    {
+        AssertNormalizeNoTrim("Hello from http://example.com/foo", "Hello from [http://example.com/foo](http://example.com/foo)", new NormalizeOptions() { ExpandAutoLinks = true, });
+        AssertNormalizeNoTrim("Hello from www.example.com/foo", "Hello from [www.example.com/foo](http://www.example.com/foo)", new NormalizeOptions() { ExpandAutoLinks = true, });
+        AssertNormalizeNoTrim("Hello from ftp://example.com", "Hello from [ftp://example.com](ftp://example.com)", new NormalizeOptions() { ExpandAutoLinks = true, });
+        AssertNormalizeNoTrim("Hello from mailto:hello@example.com", "Hello from [hello@example.com](mailto:hello@example.com)", new NormalizeOptions() { ExpandAutoLinks = true, });
+
+        AssertNormalizeNoTrim("Hello from http://example.com/foo", "Hello from http://example.com/foo", new NormalizeOptions() { ExpandAutoLinks = false, });
+        AssertNormalizeNoTrim("Hello from www.example.com/foo", "Hello from http://www.example.com/foo", new NormalizeOptions() { ExpandAutoLinks = false, });
+        AssertNormalizeNoTrim("Hello from mailto:hello@example.com", "Hello from mailto:hello@example.com", new NormalizeOptions() { ExpandAutoLinks = false, });
+    }
+
+    private static void AssertSyntax(string expected, MarkdownObject syntax)
+    {
+        var writer = new StringWriter();
+        var normalizer = new NormalizeRenderer(writer);
+        var document = new MarkdownDocument();
+        if (syntax is Block)
         {
-            AssertNormalizeNoTrim("- [X] This is done");
-            AssertNormalizeNoTrim("- [x] This is done",
-                                  "- [X] This is done");
-            AssertNormalizeNoTrim("- [ ] This is not done");
-
-            // ignore
-            AssertNormalizeNoTrim("[x] This is not a task list");
-            AssertNormalizeNoTrim("[ ] This is not a task list");
+            document.Add(syntax as Block);
         }
-
-        [Test]
-        public void JiraLinks()
+        else
         {
-            AssertNormalizeNoTrim("FOO-1234");
-            AssertNormalizeNoTrim("AB-1");
-
-            AssertNormalizeNoTrim("**Hello World AB-1**");
+            throw new InvalidOperationException();
         }
+        normalizer.Render(document);
 
-        [Test]
-        public void AutoLinks()
+        var actual = writer.ToString();
+
+        Assert.AreEqual(expected, actual);
+    }
+
+    public static void TestSpec(string inputText, string expectedOutputText, string extensions = null, string context = null)
+    {
+        foreach (var pipeline in TestParser.GetPipeline(extensions))
         {
-            AssertNormalizeNoTrim("Hello from http://example.com/foo", "Hello from [http://example.com/foo](http://example.com/foo)", new NormalizeOptions() { ExpandAutoLinks = true, });
-            AssertNormalizeNoTrim("Hello from www.example.com/foo", "Hello from [www.example.com/foo](http://www.example.com/foo)", new NormalizeOptions() { ExpandAutoLinks = true, });
-            AssertNormalizeNoTrim("Hello from ftp://example.com", "Hello from [ftp://example.com](ftp://example.com)", new NormalizeOptions() { ExpandAutoLinks = true, });
-            AssertNormalizeNoTrim("Hello from mailto:hello@example.com", "Hello from [hello@example.com](mailto:hello@example.com)", new NormalizeOptions() { ExpandAutoLinks = true, });
-
-            AssertNormalizeNoTrim("Hello from http://example.com/foo", "Hello from http://example.com/foo", new NormalizeOptions() { ExpandAutoLinks = false, });
-            AssertNormalizeNoTrim("Hello from www.example.com/foo", "Hello from http://www.example.com/foo", new NormalizeOptions() { ExpandAutoLinks = false, });
-            AssertNormalizeNoTrim("Hello from mailto:hello@example.com", "Hello from mailto:hello@example.com", new NormalizeOptions() { ExpandAutoLinks = false, });
-        }
-
-        private static void AssertSyntax(string expected, MarkdownObject syntax)
-        {
-            var writer = new StringWriter();
-            var normalizer = new NormalizeRenderer(writer);
-            var document = new MarkdownDocument();
-            if (syntax is Block)
-            {
-                document.Add(syntax as Block);
-            }
-            else
-            {
-                throw new InvalidOperationException();
-            }
-            normalizer.Render(document);
-
-            var actual = writer.ToString();
-
-            Assert.AreEqual(expected, actual);
-        }
-
-        public static void TestSpec(string inputText, string expectedOutputText, string extensions = null, string context = null)
-        {
-            foreach (var pipeline in TestParser.GetPipeline(extensions))
-            {
-                AssertNormalize(inputText, expectedOutputText, trim: false, pipeline: pipeline.Value, context: context);
-            }
-        }
-
-        public static void AssertNormalizeNoTrim(string input, string expected = null, NormalizeOptions options = null)
-            => AssertNormalize(input, expected, false, options);
-
-        public static void AssertNormalize(string input, string expected = null, bool trim = true, NormalizeOptions options = null, MarkdownPipeline pipeline = null, string context = null)
-        {
-            expected = expected ?? input;
-            input = NormText(input, trim);
-            expected = NormText(expected, trim);
-
-            pipeline = pipeline ?? new MarkdownPipelineBuilder()
-                .UseAutoLinks()
-                .UseJiraLinks(new Extensions.JiraLinks.JiraLinkOptions("https://jira.example.com"))
-                .UseTaskLists()
-                .Build();
-
-            var result = Markdown.Normalize(input, options, pipeline: pipeline);
-            result = NormText(result, trim);
-
-            TestParser.PrintAssertExpected(input, result, expected, context);
-        }
-
-        private static string NormText(string text, bool trim)
-        {
-            if (trim)
-            {
-                text = text.Trim();
-            }
-            return text.Replace("\r\n", "\n").Replace('\r', '\n');
+            AssertNormalize(inputText, expectedOutputText, trim: false, pipeline: pipeline.Value, context: context);
         }
     }
+
+    public static void AssertNormalizeNoTrim(string input, string expected = null, NormalizeOptions options = null)
+        => AssertNormalize(input, expected, false, options);
+
+    public static void AssertNormalize(string input, string expected = null, bool trim = true, NormalizeOptions options = null, MarkdownPipeline pipeline = null, string context = null)
+    {
+        expected = expected ?? input;
+        input = NormText(input, trim);
+        expected = NormText(expected, trim);
+
+        pipeline = pipeline ?? new MarkdownPipelineBuilder()
+            .UseAutoLinks()
+            .UseJiraLinks(new Extensions.JiraLinks.JiraLinkOptions("https://jira.example.com"))
+            .UseTaskLists()
+            .Build();
+
+        var result = Markdown.Normalize(input, options, pipeline: pipeline);
+        result = NormText(result, trim);
+
+        TestParser.PrintAssertExpected(input, result, expected, context);
+    }
+
+    private static string NormText(string text, bool trim)
+    {
+        if (trim)
+        {
+            text = text.Trim();
+        }
+        return text.Replace("\r\n", "\n").Replace('\r', '\n');
+    }
 }

src/Markdig.Tests/TestOrderedList.cs

@@ -1,43 +1,41 @@
-// Copyright (c) Alexandre Mutel. All rights reserved.
+// Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
 
 using Markdig.Helpers;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestOrderedList
 {
-    [TestFixture]
-    public class TestOrderedList
+    [Test]
+    public void TestReplace()
     {
-        [Test]
-        public void TestReplace()
+        var list = new OrderedList<ITest>
         {
-            var list = new OrderedList<ITest>
-            {
-                new A(),
-                new B(),
-                new C(),
-            };
+            new A(),
+            new B(),
+            new C(),
+        };
 
-            // Replacing B with D. Order should now be A, D, B.
-            var result = list.Replace<B>(new D());
-            Assert.That(result, Is.True);
-            Assert.That(list.Count, Is.EqualTo(3));
-            Assert.That(list[0], Is.InstanceOf<A>());
-            Assert.That(list[1], Is.InstanceOf<D>());
-            Assert.That(list[2], Is.InstanceOf<C>());
+        // Replacing B with D. Order should now be A, D, B.
+        var result = list.Replace<B>(new D());
+        Assert.That(result, Is.True);
+        Assert.That(list.Count, Is.EqualTo(3));
+        Assert.That(list[0], Is.InstanceOf<A>());
+        Assert.That(list[1], Is.InstanceOf<D>());
+        Assert.That(list[2], Is.InstanceOf<C>());
 
-            // Replacing B again should fail, as it's no longer in the list.
-            Assert.That(list.Replace<B>(new D()), Is.False);
-        }
-
-        #region Test fixtures
-        private interface ITest { }
-        private class A : ITest { }
-        private class B : ITest { }
-        private class C : ITest { }
-        private class D : ITest { }
-        #endregion
+        // Replacing B again should fail, as it's no longer in the list.
+        Assert.That(list.Replace<B>(new D()), Is.False);
     }
+
+    #region Test fixtures
+    private interface ITest { }
+    private class A : ITest { }
+    private class B : ITest { }
+    private class C : ITest { }
+    private class D : ITest { }
+    #endregion
 }

src/Markdig.Tests/TestParser.cs

@@ -1,201 +1,196 @@
 // Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;
+
 using Markdig.Extensions.JiraLinks;
 using Markdig.Renderers.Roundtrip;
 using Markdig.Syntax;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestParser
 {
-    public class TestParser
+    [Test]
+    public void EnsureSpecsAreUpToDate()
     {
-        [Test]
-        public void EnsureSpecsAreUpToDate()
+        // In CI, SpecFileGen is guaranteed to run
+        if (IsContinuousIntegration)
+            return;
+
+        var specsFilePaths = Directory.GetDirectories(TestsDirectory)
+            .Where(dir => dir.EndsWith("Specs"))
+            .SelectMany(dir => Directory.GetFiles(dir)
+                .Where(file => file.EndsWith(".md", StringComparison.OrdinalIgnoreCase))
+                .Where(file => file.IndexOf("readme", StringComparison.OrdinalIgnoreCase) == -1))
+            .ToArray();
+
+        var specsMarkdown = new string[specsFilePaths.Length];
+        var specsSyntaxTrees = new MarkdownDocument[specsFilePaths.Length];
+
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseAdvancedExtensions()
+            .Build();
+
+        for (int i = 0; i < specsFilePaths.Length; i++)
         {
-            // In CI, SpecFileGen is guaranteed to run
-            if (IsContinuousIntegration)
-                return;
-
-            var specsFilePaths = Directory.GetDirectories(TestsDirectory)
-                .Where(dir => dir.EndsWith("Specs"))
-                .SelectMany(dir => Directory.GetFiles(dir)
-                    .Where(file => file.EndsWith(".md", StringComparison.OrdinalIgnoreCase))
-                    .Where(file => file.IndexOf("readme", StringComparison.OrdinalIgnoreCase) == -1))
-                .ToArray();
-
-            var specsMarkdown = new string[specsFilePaths.Length];
-            var specsSyntaxTrees = new MarkdownDocument[specsFilePaths.Length];
-
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseAdvancedExtensions()
-                .Build();
-
-            for (int i = 0; i < specsFilePaths.Length; i++)
-            {
-                string markdown = specsMarkdown[i] = File.ReadAllText(specsFilePaths[i]);
-                specsSyntaxTrees[i] = Markdown.Parse(markdown, pipeline);
-            }
-
-            foreach (var specFilePath in specsFilePaths)
-            {
-                string testFilePath = Path.ChangeExtension(specFilePath, ".generated.cs");
-
-                Assert.True(File.Exists(testFilePath),
-                    "A new specification file has been added. Add the spec to the list in SpecFileGen and regenerate the tests.");
-
-                DateTime specTime = File.GetLastWriteTimeUtc(specFilePath);
-                DateTime testTime = File.GetLastWriteTimeUtc(testFilePath);
-
-                // If file creation times aren't preserved by git, add some leeway
-                // If specs have come from git, assume that they were regenerated since CI would fail otherwise
-                testTime = testTime.AddMinutes(3);
-
-                // This might not catch a changed spec every time, but should at least sometimes. Otherwise CI will catch it
-
-                // This could also trigger, if a user has modified the spec file but reverted the change - can't think of a good workaround
-                Assert.Less(specTime, testTime,
-                    $"{Path.GetFileName(specFilePath)} has been modified. Run SpecFileGen to regenerate the tests. " +
-                    "If you have modified a specification file, but reverted all changes, ignore this error or revert the 'changed' timestamp metadata on the file.");
-            }
-
-            TestDescendantsOrder.TestSchemas(specsSyntaxTrees);
+            string markdown = specsMarkdown[i] = File.ReadAllText(specsFilePaths[i]);
+            specsSyntaxTrees[i] = Markdown.Parse(markdown, pipeline);
         }
 
-        [Test]
-        public void ParseEmptyDocumentWithTrackTriviaEnabled()
+        foreach (var specFilePath in specsFilePaths)
         {
-            var document = Markdown.Parse("", trackTrivia: true);
-            using var sw = new StringWriter();
-            new RoundtripRenderer(sw).Render(document);
-            Assert.AreEqual("", sw.ToString());
+            string testFilePath = Path.ChangeExtension(specFilePath, ".generated.cs");
+
+            Assert.True(File.Exists(testFilePath),
+                "A new specification file has been added. Add the spec to the list in SpecFileGen and regenerate the tests.");
+
+            DateTime specTime = File.GetLastWriteTimeUtc(specFilePath);
+            DateTime testTime = File.GetLastWriteTimeUtc(testFilePath);
+
+            // If file creation times aren't preserved by git, add some leeway
+            // If specs have come from git, assume that they were regenerated since CI would fail otherwise
+            testTime = testTime.AddMinutes(3);
+
+            // This might not catch a changed spec every time, but should at least sometimes. Otherwise CI will catch it
+
+            // This could also trigger, if a user has modified the spec file but reverted the change - can't think of a good workaround
+            Assert.Less(specTime, testTime,
+                $"{Path.GetFileName(specFilePath)} has been modified. Run SpecFileGen to regenerate the tests. " +
+                "If you have modified a specification file, but reverted all changes, ignore this error or revert the 'changed' timestamp metadata on the file.");
         }
 
-        public static void TestSpec(string inputText, string expectedOutputText, string extensions = null, bool plainText = false, string context = null)
+        TestDescendantsOrder.TestSchemas(specsSyntaxTrees);
+    }
+
+    [Test]
+    public void ParseEmptyDocumentWithTrackTriviaEnabled()
+    {
+        var document = Markdown.Parse("", trackTrivia: true);
+        using var sw = new StringWriter();
+        new RoundtripRenderer(sw).Render(document);
+        Assert.AreEqual("", sw.ToString());
+    }
+
+    public static void TestSpec(string inputText, string expectedOutputText, string extensions = null, bool plainText = false, string context = null)
+    {
+        context ??= string.Empty;
+        if (!string.IsNullOrEmpty(context))
         {
-            context ??= string.Empty;
-            if (!string.IsNullOrEmpty(context))
+            context += "\n";
+        }
+        foreach (var pipeline in GetPipeline(extensions))
+        {
+            TestSpec(inputText, expectedOutputText, pipeline.Value, plainText, context: context + $"Pipeline configured with extensions: {pipeline.Key}");
+        }
+    }
+
+    public static void TestSpec(string inputText, string expectedOutputText, MarkdownPipeline pipeline, bool plainText = false, string context = null)
+    {
+        // Uncomment this line to get more debug information for process inlines.
+        //pipeline.DebugLog = Console.Out;
+        var result = plainText ? Markdown.ToPlainText(inputText, pipeline) : Markdown.ToHtml(inputText, pipeline);
+
+        result = Compact(result);
+        expectedOutputText = Compact(expectedOutputText);
+
+        PrintAssertExpected(inputText, result, expectedOutputText, context);
+    }
+
+    public static void PrintAssertExpected(string source, string result, string expected, string context = null)
+    {
+        if (expected != result)
+        {
+            if (context != null)
             {
-                context += "\n";
+                Console.WriteLine(context);
             }
-            foreach (var pipeline in GetPipeline(extensions))
+            Console.WriteLine("```````````````````Source");
+            Console.WriteLine(DisplaySpaceAndTabs(source));
+            Console.WriteLine("```````````````````Result");
+            Console.WriteLine(DisplaySpaceAndTabs(result));
+            Console.WriteLine("```````````````````Expected");
+            Console.WriteLine(DisplaySpaceAndTabs(expected));
+            Console.WriteLine("```````````````````");
+            Console.WriteLine();
+            TextAssert.AreEqual(expected, result);
+        }
+    }
+
+    public static IEnumerable<KeyValuePair<string, MarkdownPipeline>> GetPipeline(string extensionsGroupText)
+    {
+        // For the standard case, we make sure that both the CommmonMark core and Extra/Advanced are CommonMark compliant!
+        if (string.IsNullOrEmpty(extensionsGroupText))
+        {
+            yield return new KeyValuePair<string, MarkdownPipeline>("default", new MarkdownPipelineBuilder().Build());
+
+            //yield return new KeyValuePair<string, MarkdownPipeline>("default-trivia", new MarkdownPipelineBuilder().EnableTrackTrivia().Build());
+
+            yield return new KeyValuePair<string, MarkdownPipeline>("advanced", new MarkdownPipelineBuilder()  // Use similar to advanced extension without auto-identifier
+             .UseAbbreviations()
+            //.UseAutoIdentifiers()
+            .UseCitations()
+            .UseCustomContainers()
+            .UseDefinitionLists()
+            .UseEmphasisExtras()
+            .UseFigures()
+            .UseFooters()
+            .UseFootnotes()
+            .UseGridTables()
+            .UseMathematics()
+            .UseMediaLinks()
+            .UsePipeTables()
+            .UseListExtras()
+            .UseGenericAttributes().Build());
+
+            yield break;
+        }
+
+        var extensionGroups = extensionsGroupText.Split(new[] { '|' }, StringSplitOptions.RemoveEmptyEntries);
+        foreach (var extensionsText in extensionGroups)
+        {
+            var builder = new MarkdownPipelineBuilder();
+            builder.DebugLog = Console.Out;
+            if (extensionsText == "jiralinks")
             {
-                TestSpec(inputText, expectedOutputText, pipeline.Value, plainText, context: context + $"Pipeline configured with extensions: {pipeline.Key}");
+                builder.UseJiraLinks(new JiraLinkOptions("http://your.company.abc"));
             }
-        }
-
-        public static void TestSpec(string inputText, string expectedOutputText, MarkdownPipeline pipeline, bool plainText = false, string context = null)
-        {
-            // Uncomment this line to get more debug information for process inlines.
-            //pipeline.DebugLog = Console.Out;
-            var result = plainText ? Markdown.ToPlainText(inputText, pipeline) : Markdown.ToHtml(inputText, pipeline);
-
-            result = Compact(result);
-            expectedOutputText = Compact(expectedOutputText);
-
-            PrintAssertExpected(inputText, result, expectedOutputText, context);
-        }
-
-        public static void PrintAssertExpected(string source, string result, string expected, string context = null)
-        {
-            if (expected != result)
+            else
             {
-                if (context != null)
-                {
-                    Console.WriteLine(context);
-                }
-                Console.WriteLine("```````````````````Source");
-                Console.WriteLine(DisplaySpaceAndTabs(source));
-                Console.WriteLine("```````````````````Result");
-                Console.WriteLine(DisplaySpaceAndTabs(result));
-                Console.WriteLine("```````````````````Expected");
-                Console.WriteLine(DisplaySpaceAndTabs(expected));
-                Console.WriteLine("```````````````````");
-                Console.WriteLine();
-                TextAssert.AreEqual(expected, result);
+                builder = extensionsText == "self" ? builder.UseSelfPipeline() : builder.Configure(extensionsText);
             }
+            yield return new KeyValuePair<string, MarkdownPipeline>(extensionsText, builder.Build());
         }
+    }
 
-        public static IEnumerable<KeyValuePair<string, MarkdownPipeline>> GetPipeline(string extensionsGroupText)
+    public static string DisplaySpaceAndTabs(string text)
+    {
+        // Output special characters to check correctly the results
+        return text.Replace('\t', '→').Replace(' ', '·');
+    }
+
+    private static string Compact(string html)
+    {
+        // Normalize the output to make it compatible with CommonMark specs
+        html = html.Replace("\r\n", "\n").Replace(@"\r", @"\n").Trim();
+        html = Regex.Replace(html, @"\s+</li>", "</li>");
+        html = Regex.Replace(html, @"<li>\s+", "<li>");
+        html = html.Normalize(NormalizationForm.FormKD);
+        return html;
+    }
+
+    public static readonly bool IsContinuousIntegration = Environment.GetEnvironmentVariable("CI") != null;
+
+    public static readonly string TestsDirectory = Path.GetFullPath(Path.Combine(Path.GetDirectoryName(typeof(TestParser).Assembly.Location), "../../.."));
+
+    static TestParser()
+    {
+        const string RunningInsideVisualStudioPath = "\\src\\.vs\\markdig\\";
+        int index = TestsDirectory.IndexOf(RunningInsideVisualStudioPath);
+        if (index != -1)
         {
-            // For the standard case, we make sure that both the CommmonMark core and Extra/Advanced are CommonMark compliant!
-            if (string.IsNullOrEmpty(extensionsGroupText))
-            {
-                yield return new KeyValuePair<string, MarkdownPipeline>("default", new MarkdownPipelineBuilder().Build());
-
-                //yield return new KeyValuePair<string, MarkdownPipeline>("default-trivia", new MarkdownPipelineBuilder().EnableTrackTrivia().Build());
-
-                yield return new KeyValuePair<string, MarkdownPipeline>("advanced", new MarkdownPipelineBuilder()  // Use similar to advanced extension without auto-identifier
-                 .UseAbbreviations()
-                //.UseAutoIdentifiers()
-                .UseCitations()
-                .UseCustomContainers()
-                .UseDefinitionLists()
-                .UseEmphasisExtras()
-                .UseFigures()
-                .UseFooters()
-                .UseFootnotes()
-                .UseGridTables()
-                .UseMathematics()
-                .UseMediaLinks()
-                .UsePipeTables()
-                .UseListExtras()
-                .UseGenericAttributes().Build());
-
-                yield break;
-            }
-
-            var extensionGroups = extensionsGroupText.Split(new[] { '|' }, StringSplitOptions.RemoveEmptyEntries);
-            foreach (var extensionsText in extensionGroups)
-            {
-                var builder = new MarkdownPipelineBuilder();
-                builder.DebugLog = Console.Out;
-                if (extensionsText == "jiralinks")
-                {
-                    builder.UseJiraLinks(new JiraLinkOptions("http://your.company.abc"));
-                }
-                else
-                {
-                    builder = extensionsText == "self" ? builder.UseSelfPipeline() : builder.Configure(extensionsText);
-                }
-                yield return new KeyValuePair<string, MarkdownPipeline>(extensionsText, builder.Build());
-            }
-        }
-
-        public static string DisplaySpaceAndTabs(string text)
-        {
-            // Output special characters to check correctly the results
-            return text.Replace('\t', '→').Replace(' ', '·');
-        }
-
-        private static string Compact(string html)
-        {
-            // Normalize the output to make it compatible with CommonMark specs
-            html = html.Replace("\r\n", "\n").Replace(@"\r", @"\n").Trim();
-            html = Regex.Replace(html, @"\s+</li>", "</li>");
-            html = Regex.Replace(html, @"<li>\s+", "<li>");
-            html = html.Normalize(NormalizationForm.FormKD);
-            return html;
-        }
-
-        public static readonly bool IsContinuousIntegration = Environment.GetEnvironmentVariable("CI") != null;
-
-        public static readonly string TestsDirectory = Path.GetFullPath(Path.Combine(Path.GetDirectoryName(typeof(TestParser).Assembly.Location), "../../.."));
-
-        static TestParser()
-        {
-            const string RunningInsideVisualStudioPath = "\\src\\.vs\\markdig\\";
-            int index = TestsDirectory.IndexOf(RunningInsideVisualStudioPath);
-            if (index != -1)
-            {
-                TestsDirectory = TestsDirectory.Substring(0, index) + "\\src\\Markdig.Tests";
-            }
+            TestsDirectory = TestsDirectory.Substring(0, index) + "\\src\\Markdig.Tests";
         }
     }
 }

src/Markdig.Tests/TestPipeTable.cs

@@ -1,24 +1,58 @@
 using Markdig.Extensions.Tables;
 using Markdig.Syntax;
-using NUnit.Framework;
-using System.Linq;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public sealed class TestPipeTable
 {
-    [TestFixture]
-    public sealed class TestPipeTable
+    [TestCase("| S | T |\r\n|---|---| \r\n| G | H |")]
+    [TestCase("| S | T |\r\n|---|---|\t\r\n| G | H |")]
+    [TestCase("| S | T |\r\n|---|---|\f\r\n| G | H |")]
+    [TestCase("| S | \r\n|---|\r\n| G |\r\n\r\n| D | D |\r\n| ---| ---| \r\n| V | V |", 2)]
+    public void TestTableBug(string markdown, int tableCount = 1)
     {
-        [TestCase("| S | T |\r\n|---|---| \r\n| G | H |")]
-        [TestCase("| S | T |\r\n|---|---|\t\r\n| G | H |")]
-        [TestCase("| S | T |\r\n|---|---|\f\r\n| G | H |")]
-        [TestCase("| S | \r\n|---|\r\n| G |\r\n\r\n| D | D |\r\n| ---| ---| \r\n| V | V |", 2)]
-        public void TestTableBug(string markdown, int tableCount = 1)
+        MarkdownDocument document =
+            Markdown.Parse(markdown, new MarkdownPipelineBuilder().UseAdvancedExtensions().Build());
+
+        Table[] tables = document.Descendants().OfType<Table>().ToArray();
+
+        Assert.AreEqual(tableCount, tables.Length);
+    }
+
+    [TestCase("A | B\r\n---|---", new[] {50.0f, 50.0f})]
+    [TestCase("A | B\r\n-|---", new[] {25.0f, 75.0f})]
+    [TestCase("A | B\r\n-|---\r\nA | B\r\n---|---", new[] {25.0f, 75.0f})]
+    [TestCase("A | B\r\n---|---|---", new[] {33.33f, 33.33f, 33.33f})]
+    [TestCase("A | B\r\n---|---|---|", new[] {33.33f, 33.33f, 33.33f})]
+    public void TestColumnWidthByHeaderLines(string markdown, float[] expectedWidth)
+    {
+        var pipeline = new MarkdownPipelineBuilder()
+            .UsePipeTables(new PipeTableOptions() {InferColumnWidthsFromSeparator = true})
+            .Build();
+        var document = Markdown.Parse(markdown, pipeline);
+        var table = document.Descendants().OfType<Table>().FirstOrDefault();
+        Assert.IsNotNull(table);
+        var actualWidths = table.ColumnDefinitions.Select(x => x.Width).ToList();
+        Assert.AreEqual(actualWidths.Count, expectedWidth.Length);
+        for (int i = 0; i < expectedWidth.Length; i++)
         {
-            MarkdownDocument document = Markdown.Parse(markdown, new MarkdownPipelineBuilder().UseAdvancedExtensions().Build());
+            Assert.AreEqual(actualWidths[i], expectedWidth[i], 0.01);
+        }
+    }
 
-            Table[] tables = document.Descendants().OfType<Table>().ToArray();
-
-            Assert.AreEqual(tableCount, tables.Length);
+    [Test]
+    public void TestColumnWidthIsNotSetWithoutConfigurationFlag()
+    {
+        var pipeline = new MarkdownPipelineBuilder()
+            .UsePipeTables(new PipeTableOptions() {InferColumnWidthsFromSeparator = false})
+            .Build();
+        var document = Markdown.Parse("| A | B | C |\r\n|---|---|---|", pipeline);
+        var table = document.Descendants().OfType<Table>().FirstOrDefault();
+        Assert.IsNotNull(table);
+        foreach (var column in table.ColumnDefinitions)
+        {
+            Assert.AreEqual(0, column.Width);
         }
     }
 }

src/Markdig.Tests/TestPlainText.cs

@@ -1,45 +1,50 @@
-using NUnit.Framework;
+namespace Markdig.Tests;
 
-namespace Markdig.Tests
+[TestFixture]
+public class TestPlainText
 {
-    [TestFixture]
-    public class TestPlainText
+    [Test]
+    [TestCase(/* markdownText: */ "foo bar", /* expected: */ "foo bar\n")]
+    [TestCase(/* markdownText: */ "foo\nbar", /* expected: */ "foo\nbar\n")]
+    [TestCase(/* markdownText: */ "*foo\nbar*", /* expected: */ "foo\nbar\n")]
+    [TestCase(/* markdownText: */ "[foo\nbar](http://example.com)", /* expected: */ "foo\nbar\n")]
+    [TestCase(/* markdownText: */ "<http://foo.bar.baz>", /* expected: */ "http://foo.bar.baz\n")]
+    [TestCase(/* markdownText: */ "# foo bar", /* expected: */ "foo bar\n")]
+    [TestCase(/* markdownText: */ "# foo\nbar", /* expected: */ "foo\nbar\n")]
+    [TestCase(/* markdownText: */ "> foo", /* expected: */ "foo\n")]
+    [TestCase(/* markdownText: */ "> foo\nbar\n> baz", /* expected: */ "foo\nbar\nbaz\n")]
+    [TestCase(/* markdownText: */ "`foo`", /* expected: */ "foo\n")]
+    [TestCase(/* markdownText: */ "`foo\nbar`", /* expected: */ "foo bar\n")] // new line within codespan is treated as whitespace (Example317)
+    [TestCase(/* markdownText: */ "```\nfoo bar\n```", /* expected: */ "foo bar\n")]
+    [TestCase(/* markdownText: */ "- foo\n- bar\n- baz", /* expected: */ "foo\nbar\nbaz\n")]
+    [TestCase(/* markdownText: */ "- foo<baz", /* expected: */ "foo<baz\n")]
+    [TestCase(/* markdownText: */ "- foo&lt;baz", /* expected: */ "foo<baz\n")]
+    [TestCase(/* markdownText: */ "## foo `bar::baz >`", /* expected: */ "foo bar::baz >\n")]
+    public void TestPlainEnsureNewLine(string markdownText, string expected)
     {
-        [Test]
-        [TestCase(/* markdownText: */ "foo bar", /* expected: */ "foo bar\n")]
-        [TestCase(/* markdownText: */ "foo\nbar", /* expected: */ "foo\nbar\n")]
-        [TestCase(/* markdownText: */ "*foo\nbar*", /* expected: */ "foo\nbar\n")]
-        [TestCase(/* markdownText: */ "[foo\nbar](http://example.com)", /* expected: */ "foo\nbar\n")]
-        [TestCase(/* markdownText: */ "<http://foo.bar.baz>", /* expected: */ "http://foo.bar.baz\n")]
-        [TestCase(/* markdownText: */ "# foo bar", /* expected: */ "foo bar\n")]
-        [TestCase(/* markdownText: */ "# foo\nbar", /* expected: */ "foo\nbar\n")]
-        [TestCase(/* markdownText: */ "> foo", /* expected: */ "foo\n")]
-        [TestCase(/* markdownText: */ "> foo\nbar\n> baz", /* expected: */ "foo\nbar\nbaz\n")]
-        [TestCase(/* markdownText: */ "`foo`", /* expected: */ "foo\n")]
-        [TestCase(/* markdownText: */ "`foo\nbar`", /* expected: */ "foo bar\n")] // new line within codespan is treated as whitespace (Example317)
-        [TestCase(/* markdownText: */ "```\nfoo bar\n```", /* expected: */ "foo bar\n")]
-        [TestCase(/* markdownText: */ "- foo\n- bar\n- baz", /* expected: */ "foo\nbar\nbaz\n")]
-        [TestCase(/* markdownText: */ "- foo<baz", /* expected: */ "foo<baz\n")]
-        [TestCase(/* markdownText: */ "- foo&lt;baz", /* expected: */ "foo<baz\n")]
-        [TestCase(/* markdownText: */ "## foo `bar::baz >`", /* expected: */ "foo bar::baz >\n")]
-        public void TestPlainEnsureNewLine(string markdownText, string expected)
-        {
-            var actual = Markdown.ToPlainText(markdownText);
-            Assert.AreEqual(expected, actual);
-        }
+        var actual = Markdown.ToPlainText(markdownText);
+        Assert.AreEqual(expected, actual);
+    }
 
-        [Test]
-        [TestCase(/* markdownText: */ ":::\nfoo\n:::", /* expected: */ "foo\n", /*extensions*/ "customcontainers|advanced")]
-        [TestCase(/* markdownText: */ ":::bar\nfoo\n:::", /* expected: */ "foo\n", /*extensions*/ "customcontainers+attributes|advanced")]
-        [TestCase(/* markdownText: */ "| Header1 | Header2 | Header3 |\n|--|--|--|\nt**es**t|value2|value3", /* expected: */ "Header1 Header2 Header3 test value2 value3","pipetables")]
-        public void TestPlainWithExtensions(string markdownText, string expected, string extensions)
-        {
-            TestParser.TestSpec(markdownText, expected, extensions, plainText: true);
-        }
+    [Test]
+    [TestCase(/* markdownText: */ "```\nConsole.WriteLine(\"Hello, World!\");\n```", /* expected: */ "Console.WriteLine(\"Hello, World!\");\n")]
+    public void TestPlainCodeBlock(string markdownText, string expected)
+    {
+        var actual = Markdown.ToPlainText(markdownText);
+        Assert.AreEqual(expected, actual);
+    }
 
-        public static void TestSpec(string markdownText, string expected, string extensions, string context = null)
-        {
-            TestParser.TestSpec(markdownText, expected, extensions, plainText: true, context: context);
-        }
+    [Test]
+    [TestCase(/* markdownText: */ ":::\nfoo\n:::", /* expected: */ "foo\n", /*extensions*/ "customcontainers|advanced")]
+    [TestCase(/* markdownText: */ ":::bar\nfoo\n:::", /* expected: */ "foo\n", /*extensions*/ "customcontainers+attributes|advanced")]
+    [TestCase(/* markdownText: */ "| Header1 | Header2 | Header3 |\n|--|--|--|\nt**es**t|value2|value3", /* expected: */ "Header1 Header2 Header3 test value2 value3","pipetables")]
+    public void TestPlainWithExtensions(string markdownText, string expected, string extensions)
+    {
+        TestParser.TestSpec(markdownText, expected, extensions, plainText: true);
+    }
+
+    public static void TestSpec(string markdownText, string expected, string extensions, string context = null)
+    {
+        TestParser.TestSpec(markdownText, expected, extensions, plainText: true, context: context);
     }
 }

src/Markdig.Tests/TestPlayParser.cs

@@ -1,97 +1,109 @@
 // Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
-using System;
-using System.Linq;
 using Markdig.Syntax;
 using Markdig.Syntax.Inlines;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestPlayParser
 {
-    [TestFixture]
-    public class TestPlayParser
+
+    [Test]
+    public void TestInvalidSetext()
     {
-        [Test]
-        public void TestBugWithEmphasisAndTable()
-        {
-            TestParser.TestSpec("**basics | 8:00**", "<p><strong>basics | 8:00</strong></p>", "advanced");
-        }
+        TestParser.TestSpec("test\n===n", "<p>test\n===n</p>", "advanced");
+    }
 
-        [Test]
-        public void TestLinksWithCarriageReturn()
-        {
-            var text = "[Link 1][link-1], [link 2][link-2].\r\n\r\n[link-1]: https://example.com\r\n[link-2]: https://example.com";
-            var result = Markdown.ToHtml(text).TrimEnd();
-            Assert.AreEqual("<p><a href=\"https://example.com\">Link 1</a>, <a href=\"https://example.com\">link 2</a>.</p>", result);
-        }
+    [Test]
+    public void TestBugWithEmphasisAndTable()
+    {
+        TestParser.TestSpec("**basics | 8:00**", "<p><strong>basics | 8:00</strong></p>", "advanced");
+    }
 
-        [Test]
-        public void TestLinksWithTitleAndCarriageReturn()
-        {
-            var text = "[Link 1][link-1], [link 2][link-2].\r\n\r\n[link-1]: https://example.com \"title 1\" \r\n[link-2]: https://example.com \"title 2\"";
-            var result = Markdown.ToHtml(text).TrimEnd();
-            Assert.AreEqual("<p><a href=\"https://example.com\" title=\"title 1\">Link 1</a>, <a href=\"https://example.com\" title=\"title 2\">link 2</a>.</p>", result);
-        }
+    [Test]
+    public void TestLinksWithCarriageReturn()
+    {
+        var text = "[Link 1][link-1], [link 2][link-2].\r\n\r\n[link-1]: https://example.com\r\n[link-2]: https://example.com";
+        var result = Markdown.ToHtml(text).TrimEnd();
+        Assert.AreEqual("<p><a href=\"https://example.com\">Link 1</a>, <a href=\"https://example.com\">link 2</a>.</p>", result);
+    }
 
-        [Test]
-        public void TestLink()
-        {
-            var doc = Markdown.Parse("There is a ![link](/yoyo)");
-            var link = doc.Descendants<ParagraphBlock>().SelectMany(x => x.Inline.Descendants<LinkInline>()).FirstOrDefault(l => l.IsImage);
-            Assert.AreEqual("/yoyo", link?.Url);
-        }
+    [Test]
+    public void TestLinksWithTitleAndCarriageReturn()
+    {
+        var text = "[Link 1][link-1], [link 2][link-2].\r\n\r\n[link-1]: https://example.com \"title 1\" \r\n[link-2]: https://example.com \"title 2\"";
+        var result = Markdown.ToHtml(text).TrimEnd();
+        Assert.AreEqual("<p><a href=\"https://example.com\" title=\"title 1\">Link 1</a>, <a href=\"https://example.com\" title=\"title 2\">link 2</a>.</p>", result);
+    }
 
-        [Test]
-        public void TestListBug2()
-        {
-            TestParser.TestSpec("10.\t*test* – test\n\n11.\t__test__ test\n\n", @"<ol start=""10"">
+    [Test]
+    public void TestLink()
+    {
+        var doc = Markdown.Parse("There is a ![link](/yoyo)");
+        var link = doc.Descendants<ParagraphBlock>().SelectMany(x => x.Inline.Descendants<LinkInline>()).FirstOrDefault(l => l.IsImage);
+        Assert.AreEqual("/yoyo", link?.Url);
+    }
+
+    [Test]
+    public void TestLinkWithMultipleBackslashesInTitle()
+    {
+        var doc = Markdown.Parse(@"[link](/uri '\\\\127.0.0.1')");
+        var link = doc.Descendants<LinkInline>().FirstOrDefault();
+        Assert.AreEqual(@"\\127.0.0.1", link?.Title);
+    }
+
+    [Test]
+    public void TestListBug2()
+    {
+        TestParser.TestSpec("10.\t*test* – test\n\n11.\t__test__ test\n\n", @"<ol start=""10"">
 <li><p><em>test</em> – test</p>
 </li>
 <li><p><strong>test</strong> test</p>
 </li>
 </ol>
 ");
-        }
+    }
 
-        [Test]
-        public void TestSimple()
-        {
-            var text = @" *[HTML]: Hypertext Markup Language
+    [Test]
+    public void TestSimple()
+    {
+        var text = @" *[HTML]: Hypertext Markup Language
 
 Later in a text we are using HTML and it becomes an abbr tag HTML
 ";
-            //            var reader = new StringReader(@"> > toto tata
-            //> titi toto
-            //");
+        //            var reader = new StringReader(@"> > toto tata
+        //> titi toto
+        //");
 
-            //var result = Markdown.ToHtml(text, new MarkdownPipeline().UseFootnotes().UseEmphasisExtras());
-            var result = Markdown.ToHtml(text, new MarkdownPipelineBuilder().UseAbbreviations().Build());
-            //File.WriteAllText("test.html", result, Encoding.UTF8);
-            //Console.WriteLine(result);
-        }
+        //var result = Markdown.ToHtml(text, new MarkdownPipeline().UseFootnotes().UseEmphasisExtras());
+        var result = Markdown.ToHtml(text, new MarkdownPipelineBuilder().UseAbbreviations().Build());
+        //File.WriteAllText("test.html", result, Encoding.UTF8);
+        //Console.WriteLine(result);
+    }
 
-        [Test]
-        public void TestEmptyLiteral()
-        {
-            var text = @"> *some text*
+    [Test]
+    public void TestEmptyLiteral()
+    {
+        var text = @"> *some text*
 > some other text";
-            var doc = Markdown.Parse(text);
+        var doc = Markdown.Parse(text);
 
-            Assert.True(doc.Descendants<LiteralInline>().All(x => !x.Content.IsEmpty),
-                "There should not have any empty literals");
-        }
+        Assert.True(doc.Descendants<LiteralInline>().All(x => !x.Content.IsEmpty),
+            "There should not have any empty literals");
+    }
 
-        [Test]
-        public void TestSelfPipeline1()
-        {
-            var text = @" <!--markdig:pipetables-->
+    [Test]
+    public void TestSelfPipeline1()
+    {
+        var text = @" <!--markdig:pipetables-->
 
 a | b
 - | -
 0 | 1
 ";
-            TestParser.TestSpec(text, @"<!--markdig:pipetables-->
+        TestParser.TestSpec(text, @"<!--markdig:pipetables-->
 <table>
 <thead>
 <tr>
@@ -107,17 +119,17 @@ a | b
 </tbody>
 </table>
 ", "self");
-        }
+    }
 
-        [Test]
-        public void TestListBug()
-        {
-            // TODO: Add this test back to the CommonMark specs
-            var text = @"- item1
+    [Test]
+    public void TestListBug()
+    {
+        // TODO: Add this test back to the CommonMark specs
+        var text = @"- item1
   - item2
     - item3
       - item4";
-            TestParser.TestSpec(text, @"<ul>
+        TestParser.TestSpec(text, @"<ul>
 <li>item1
 <ul>
 <li>item2
@@ -130,13 +142,13 @@ a | b
 </ul></li>
 </ul>
 ");
-        }
+    }
 
 
-        [Test]
-        public void TestHtmlBug()
-        {
-            TestParser.TestSpec(@" # header1
+    [Test]
+    public void TestHtmlBug()
+    {
+        TestParser.TestSpec(@" # header1
 
 <pre class='copy'>
 blabla
@@ -148,43 +160,43 @@ blabla
 blabla
 </pre>
 <h1>header2</h1>");
-        }
+    }
 
-        [Test]
-        public void TestHtmlh4Bug()
-        {
-            TestParser.TestSpec(@"<h4>foobar</h4>", @"<h4>foobar</h4>");
-        }
+    [Test]
+    public void TestHtmlh4Bug()
+    {
+        TestParser.TestSpec(@"<h4>foobar</h4>", @"<h4>foobar</h4>");
+    }
 
-        [Test]
-        public void TestStandardUriEscape()
-        {
-            TestParser.TestSpec(@"![你好](你好.png)", "<p><img src=\"你好.png\" alt=\"你好\" /></p>", "nonascii-noescape");
-        }
+    [Test]
+    public void TestStandardUriEscape()
+    {
+        TestParser.TestSpec(@"![你好](你好.png)", "<p><img src=\"你好.png\" alt=\"你好\" /></p>", "nonascii-noescape");
+    }
 
 
-        [Test]
-        public void TestBugAdvanced()
-        {
-            TestParser.TestSpec(@"`https://{domain}/callbacks`
+    [Test]
+    public void TestBugAdvanced()
+    {
+        TestParser.TestSpec(@"`https://{domain}/callbacks`
 #### HEADING
 Paragraph
 ", "<p><code>https://{domain}/callbacks</code></p>\n<h4 id=\"heading\">HEADING</h4>\n<p>Paragraph</p>", "advanced");
-        }
+    }
 
 
-        [Test]
-        public void TestBugEmphAttribute()
-        {
-            // https://github.com/lunet-io/markdig/issues/108
-            TestParser.TestSpec(@"*test*{name=value}", "<p><em name=\"value\">test</em></p>", "advanced");
-        }
+    [Test]
+    public void TestBugEmphAttribute()
+    {
+        // https://github.com/lunet-io/markdig/issues/108
+        TestParser.TestSpec(@"*test*{name=value}", "<p><em name=\"value\">test</em></p>", "advanced");
+    }
 
-        [Test]
-        public void TestBugPipeTables()
-        {
-            // https://github.com/lunet-io/markdig/issues/73
-            TestParser.TestSpec(@"| abc | def |
+    [Test]
+    public void TestBugPipeTables()
+    {
+        // https://github.com/lunet-io/markdig/issues/73
+        TestParser.TestSpec(@"| abc | def |
 | --- | --- |
 | 1 | ~3 |
 ", @"<table>
@@ -201,12 +213,12 @@ Paragraph
 </tr>
 </tbody>
 </table>", "advanced");
-        }
+    }
 
-        [Test]
-        public void TestGridTableWithCustomAttributes() {
+    [Test]
+    public void TestGridTableWithCustomAttributes() {
 
-            var input = @"
+        var input = @"
 {.table}
 +---+---+
 | a | b |
@@ -215,7 +227,7 @@ Paragraph
 +---+---+
 ";
 
-            var expected = @"<table class=""table"">
+        var expected = @"<table class=""table"">
 <col style=""width:50%"" />
 <col style=""width:50%"" />
 <thead>
@@ -232,76 +244,75 @@ Paragraph
 </tbody>
 </table>
 ";
-            TestParser.TestSpec(input, expected, "advanced");
-        }
-
-        [Test]
-        public void TestSamePipelineAllExtensions()
-        {
-            var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
-
-            // Reuse the same pipeline
-            var result1 = Markdown.ToHtml("This is a \"\"citation\"\"", pipeline);
-            var result2 = Markdown.ToHtml("This is a \"\"citation\"\"", pipeline);
-
-            Assert.AreEqual("<p>This is a <cite>citation</cite></p>", result1.Trim());
-            Assert.AreEqual(result1, result2);
-        }
-
-        // Test for emoji and smileys
-        //        var text = @" This is a test with a :) and a :angry: smiley";
-
-
-        // Test for definition lists:
-        //
-        //        var text = @"
-        //Term 1
-        //:   This is a definition item
-        //    With a paragraph
-        //    > This is a block quote
-
-        //    - This is a list
-        //    - item2
-
-        //    ```java
-        //    Test
-
-
-        //    ```
-
-        //    And a lazy line
-        //:   This ia another definition item
-
-        //Term2
-        //Term3 *with some inline*
-        //:   This is another definition for term2
-        //";
-
-
-        // Test for grid table
-
-
-        //        var text = @"
-        //+-----------------------------------+--------------------------------------+
-        //| - this is a list                  | > We have a blockquote
-        //| - this is a second item           |
-        //|                                   |
-        //| ```                               |
-        //| Yes                               |
-        //| ```                               |
-        //+===================================+======================================+
-        //| This is a second line             |
-        //+-----------------------------------+--------------------------------------+
-
-        //:::spoiler  {#yessss}
-        //This is a spoiler
-        //:::
-
-        ///| we have mult | paragraph    |
-        ///| we have a new colspan with a long line
-        ///| and lots of text
-        //";
-
-
+        TestParser.TestSpec(input, expected, "advanced");
     }
+
+    [Test]
+    public void TestSamePipelineAllExtensions()
+    {
+        var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
+
+        // Reuse the same pipeline
+        var result1 = Markdown.ToHtml("This is a \"\"citation\"\"", pipeline);
+        var result2 = Markdown.ToHtml("This is a \"\"citation\"\"", pipeline);
+
+        Assert.AreEqual("<p>This is a <cite>citation</cite></p>", result1.Trim());
+        Assert.AreEqual(result1, result2);
+    }
+
+    // Test for emoji and smileys
+    //        var text = @" This is a test with a :) and a :angry: smiley";
+
+
+    // Test for definition lists:
+    //
+    //        var text = @"
+    //Term 1
+    //:   This is a definition item
+    //    With a paragraph
+    //    > This is a block quote
+
+    //    - This is a list
+    //    - item2
+
+    //    ```java
+    //    Test
+
+
+    //    ```
+
+    //    And a lazy line
+    //:   This ia another definition item
+
+    //Term2
+    //Term3 *with some inline*
+    //:   This is another definition for term2
+    //";
+
+
+    // Test for grid table
+
+
+    //        var text = @"
+    //+-----------------------------------+--------------------------------------+
+    //| - this is a list                  | > We have a blockquote
+    //| - this is a second item           |
+    //|                                   |
+    //| ```                               |
+    //| Yes                               |
+    //| ```                               |
+    //+===================================+======================================+
+    //| This is a second line             |
+    //+-----------------------------------+--------------------------------------+
+
+    //:::spoiler  {#yessss}
+    //This is a spoiler
+    //:::
+
+    ///| we have mult | paragraph    |
+    ///| we have a new colspan with a long line
+    ///| and lots of text
+    //";
+
+
 }

src/Markdig.Tests/TestPragmaLines.cs

@@ -1,19 +1,18 @@
-// Copyright (c) Alexandre Mutel. All rights reserved.
+// Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
 
 using Markdig.Syntax;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestPragmaLines
 {
-    [TestFixture]
-    public class TestPragmaLines
+    [Test]
+    public void TestFindClosest()
     {
-        [Test]
-        public void TestFindClosest()
-        {
-            var doc = Markdown.Parse(
+        var doc = Markdown.Parse(
 "test1\n" +                      // 0
 "\n" +                           // 1
 "test2\n" +                      // 2
@@ -37,27 +36,27 @@ namespace Markdig.Tests
 "- item3\n" +                    // 20
 "\n" +                           // 21
 "This is a last paragraph\n"     // 22
-                , new MarkdownPipelineBuilder().UsePragmaLines().Build());
+            , new MarkdownPipelineBuilder().UsePragmaLines().Build());
 
-            foreach (var exact in new int[] {0, 2, 4, 6, 8, 10, 18, 19, 20, 22})
-            {
-                Assert.AreEqual(exact, doc.FindClosestLine(exact));
-            }
-
-            Assert.AreEqual(22, doc.FindClosestLine(23));
-
-            Assert.AreEqual(10, doc.FindClosestLine(11));
-            Assert.AreEqual(10, doc.FindClosestLine(12));
-            Assert.AreEqual(10, doc.FindClosestLine(13));
-            Assert.AreEqual(18, doc.FindClosestLine(14)); // > 50% of the paragraph, we switch to next
-            Assert.AreEqual(18, doc.FindClosestLine(15));
-            Assert.AreEqual(18, doc.FindClosestLine(16));
+        foreach (var exact in new int[] {0, 2, 4, 6, 8, 10, 18, 19, 20, 22})
+        {
+            Assert.AreEqual(exact, doc.FindClosestLine(exact));
         }
 
-        [Test]
-        public void TestFindClosest1()
-        {
-            var text = 
+        Assert.AreEqual(22, doc.FindClosestLine(23));
+
+        Assert.AreEqual(10, doc.FindClosestLine(11));
+        Assert.AreEqual(10, doc.FindClosestLine(12));
+        Assert.AreEqual(10, doc.FindClosestLine(13));
+        Assert.AreEqual(18, doc.FindClosestLine(14)); // > 50% of the paragraph, we switch to next
+        Assert.AreEqual(18, doc.FindClosestLine(15));
+        Assert.AreEqual(18, doc.FindClosestLine(16));
+    }
+
+    [Test]
+    public void TestFindClosest1()
+    {
+        var text = 
 "- item1\n" +                    // 0
 "  - item11\n" +                 // 1
 "  - item12\n" +                 // 2
@@ -66,15 +65,14 @@ namespace Markdig.Tests
 "    - item131\n" +              // 5
 "      - item1311\n";            // 6
 
-            var pipeline = new MarkdownPipelineBuilder().UsePragmaLines().Build();
-            var doc = Markdown.Parse(text, pipeline);
+        var pipeline = new MarkdownPipelineBuilder().UsePragmaLines().Build();
+        var doc = Markdown.Parse(text, pipeline);
 
-            for (int exact = 0; exact < 7; exact++)
-            {
-                Assert.AreEqual(exact, doc.FindClosestLine(exact));
-            }
-
-            Assert.AreEqual(6, doc.FindClosestLine(50));
+        for (int exact = 0; exact < 7; exact++)
+        {
+            Assert.AreEqual(exact, doc.FindClosestLine(exact));
         }
+
+        Assert.AreEqual(6, doc.FindClosestLine(50));
     }
 }

src/Markdig.Tests/TestReferralLinks.cs

@@ -1,57 +1,54 @@
-using NUnit.Framework;
+namespace Markdig.Tests;
 
-namespace Markdig.Tests
+[TestFixture]
+public class TestReferralLinks
 {
-    [TestFixture]
-    public class TestReferralLinks
+    [Test]
+    public void TestLinksWithNoFollowRel()
     {
-        [Test]
-        public void TestLinksWithNoFollowRel()
-        {
-            var markdown = "[world](http://example.com)";
-            var expected = "nofollow";
+        var markdown = "[world](http://example.com)";
+        var expected = "nofollow";
 
 #pragma warning disable 0618
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseNoFollowLinks()
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseNoFollowLinks()
 #pragma warning restore 0618
-                .Build();
-            var html = Markdown.ToHtml(markdown, pipeline);
+            .Build();
+        var html = Markdown.ToHtml(markdown, pipeline);
 
-            Assert.That(html, Contains.Substring($"rel=\"{expected}\""));
-        }
+        Assert.That(html, Contains.Substring($"rel=\"{expected}\""));
+    }
 
-        [Test]
-        [TestCase(new[] { "nofollow" }, "nofollow")]
-        [TestCase(new[] { "noopener" }, "noopener")]
-        [TestCase(new[] { "nofollow", "noopener"}, "nofollow noopener")]
-        public void TestLinksWithCustomRel(string[] rels, string expected)
-        {
-            var markdown = "[world](http://example.com)";
+    [Test]
+    [TestCase(new[] { "nofollow" }, "nofollow")]
+    [TestCase(new[] { "noopener" }, "noopener")]
+    [TestCase(new[] { "nofollow", "noopener"}, "nofollow noopener")]
+    public void TestLinksWithCustomRel(string[] rels, string expected)
+    {
+        var markdown = "[world](http://example.com)";
 
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseReferralLinks(rels)
-                .Build();
-            var html = Markdown.ToHtml(markdown, pipeline);
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseReferralLinks(rels)
+            .Build();
+        var html = Markdown.ToHtml(markdown, pipeline);
 
-            Assert.That(html, Contains.Substring($"rel=\"{expected}\""));
-        }
+        Assert.That(html, Contains.Substring($"rel=\"{expected}\""));
+    }
 
-        [Test]
-        [TestCase(new[] { "noopener" }, "noopener")]
-        [TestCase(new[] { "nofollow" }, "nofollow")]
-        [TestCase(new[] { "nofollow", "noopener" }, "nofollow noopener")]
-        public void TestAutoLinksWithCustomRel(string[] rels, string expected)
-        {
-            var markdown = "http://example.com";
+    [Test]
+    [TestCase(new[] { "noopener" }, "noopener")]
+    [TestCase(new[] { "nofollow" }, "nofollow")]
+    [TestCase(new[] { "nofollow", "noopener" }, "nofollow noopener")]
+    public void TestAutoLinksWithCustomRel(string[] rels, string expected)
+    {
+        var markdown = "http://example.com";
 
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseAutoLinks()
-                .UseReferralLinks(rels)
-                .Build();
-            var html = Markdown.ToHtml(markdown, pipeline);
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseAutoLinks()
+            .UseReferralLinks(rels)
+            .Build();
+        var html = Markdown.ToHtml(markdown, pipeline);
 
-            Assert.That(html, Contains.Substring($"rel=\"{expected}\""));
-        }
+        Assert.That(html, Contains.Substring($"rel=\"{expected}\""));
     }
 }

src/Markdig.Tests/TestRelativeUrlReplacement.cs

@@ -1,48 +1,44 @@
-using System;
-using System.IO;
 using Markdig.Parsers;
 using Markdig.Renderers;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestRelativeUrlReplacement
 {
-    public class TestRelativeUrlReplacement
+    [Test]
+    public void ReplacesRelativeLinks()
     {
-        [Test]
-        public void ReplacesRelativeLinks()
-        {
-            TestSpec("https://example.com", "Link: [hello](/relative.jpg)", "https://example.com/relative.jpg");
-            TestSpec("https://example.com", "Link: [hello](relative.jpg)", "https://example.com/relative.jpg");
-            TestSpec("https://example.com/", "Link: [hello](/relative.jpg?a=b)", "https://example.com/relative.jpg?a=b");
-            TestSpec("https://example.com/", "Link: [hello](relative.jpg#x)", "https://example.com/relative.jpg#x");
-            TestSpec(null, "Link: [hello](relative.jpg)", "relative.jpg");
-            TestSpec(null, "Link: [hello](/relative.jpg)", "/relative.jpg");
-            TestSpec("https://example.com", "Link: [hello](/relative.jpg)", "https://example.com/relative.jpg");
-        }
+        TestSpec("https://example.com", "Link: [hello](/relative.jpg)", "https://example.com/relative.jpg");
+        TestSpec("https://example.com", "Link: [hello](relative.jpg)", "https://example.com/relative.jpg");
+        TestSpec("https://example.com/", "Link: [hello](/relative.jpg?a=b)", "https://example.com/relative.jpg?a=b");
+        TestSpec("https://example.com/", "Link: [hello](relative.jpg#x)", "https://example.com/relative.jpg#x");
+        TestSpec(null, "Link: [hello](relative.jpg)", "relative.jpg");
+        TestSpec(null, "Link: [hello](/relative.jpg)", "/relative.jpg");
+        TestSpec("https://example.com", "Link: [hello](/relative.jpg)", "https://example.com/relative.jpg");
+    }
 
-        [Test]
-        public void ReplacesRelativeImageSources()
-        {
-            TestSpec("https://example.com", "Image: ![alt text](/image.jpg)", "https://example.com/image.jpg");
-            TestSpec("https://example.com", "Image: ![alt text](image.jpg \"title\")", "https://example.com/image.jpg");
-            TestSpec(null, "Image: ![alt text](/image.jpg)", "/image.jpg");
-        }
+    [Test]
+    public void ReplacesRelativeImageSources()
+    {
+        TestSpec("https://example.com", "Image: ![alt text](/image.jpg)", "https://example.com/image.jpg");
+        TestSpec("https://example.com", "Image: ![alt text](image.jpg \"title\")", "https://example.com/image.jpg");
+        TestSpec(null, "Image: ![alt text](/image.jpg)", "/image.jpg");
+    }
 
-        public static void TestSpec(string baseUrl, string markdown, string expectedLink)
-        {
-            var pipeline = new MarkdownPipelineBuilder().Build();
+    public static void TestSpec(string baseUrl, string markdown, string expectedLink)
+    {
+        var pipeline = new MarkdownPipelineBuilder().Build();
 
-            var writer = new StringWriter();
-            var renderer = new HtmlRenderer(writer);
-            if (baseUrl != null)
-                renderer.BaseUrl = new Uri(baseUrl);
-            pipeline.Setup(renderer);
+        var writer = new StringWriter();
+        var renderer = new HtmlRenderer(writer);
+        if (baseUrl != null)
+            renderer.BaseUrl = new Uri(baseUrl);
+        pipeline.Setup(renderer);
 
-            var document = MarkdownParser.Parse(markdown, pipeline);
-            renderer.Render(document);
-            writer.Flush();
+        var document = MarkdownParser.Parse(markdown, pipeline);
+        renderer.Render(document);
+        writer.Flush();
 
-            Assert.That(writer.ToString(), Contains.Substring("=\"" + expectedLink + "\""));
-        }
+        Assert.That(writer.ToString(), Contains.Substring("=\"" + expectedLink + "\""));
     }
 }

src/Markdig.Tests/TestRoundtrip.cs

@@ -1,32 +1,29 @@
 using Markdig.Renderers.Roundtrip;
 using Markdig.Syntax;
-using NUnit.Framework;
-using System.IO;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+internal static class TestRoundtrip
 {
-    internal static class TestRoundtrip
+    internal static void TestSpec(string markdownText, string expected, string extensions, string context = null)
     {
-        internal static void TestSpec(string markdownText, string expected, string extensions, string context = null)
-        {
-            RoundTrip(markdownText, context);
-        }
+        RoundTrip(markdownText, context);
+    }
 
-        internal static void RoundTrip(string markdown, string context = null)
-        {
-            var pipelineBuilder = new MarkdownPipelineBuilder();
-            pipelineBuilder.EnableTrackTrivia();
-            pipelineBuilder.UseYamlFrontMatter();
-            MarkdownPipeline pipeline = pipelineBuilder.Build();
-            MarkdownDocument markdownDocument = Markdown.Parse(markdown, pipeline);
-            var sw = new StringWriter();
-            var nr = new RoundtripRenderer(sw);
-            pipeline.Setup(nr);
+    internal static void RoundTrip(string markdown, string context = null)
+    {
+        var pipelineBuilder = new MarkdownPipelineBuilder();
+        pipelineBuilder.EnableTrackTrivia();
+        pipelineBuilder.UseYamlFrontMatter();
+        MarkdownPipeline pipeline = pipelineBuilder.Build();
+        MarkdownDocument markdownDocument = Markdown.Parse(markdown, pipeline);
+        var sw = new StringWriter();
+        var nr = new RoundtripRenderer(sw);
+        pipeline.Setup(nr);
 
-            nr.Write(markdownDocument);
+        nr.Write(markdownDocument);
 
-            var result = sw.ToString();
-            TestParser.PrintAssertExpected("", result, markdown, context);
-        }
+        var result = sw.ToString();
+        TestParser.PrintAssertExpected("", result, markdown, context);
     }
 }

src/Markdig.Tests/TestSmartyPants.cs

@@ -1,36 +1,34 @@
 using Markdig.Extensions.SmartyPants;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestSmartyPants
 {
-    public class TestSmartyPants
+    [Test]
+    public void MappingCanBeReconfigured()
     {
-        [Test]
-        public void MappingCanBeReconfigured()
-        {
-            SmartyPantOptions options = new SmartyPantOptions();
-            options.Mapping[SmartyPantType.LeftAngleQuote] = "foo";
-            options.Mapping[SmartyPantType.RightAngleQuote] = "bar";
+        var options = new SmartyPantOptions();
+        options.Mapping[SmartyPantType.LeftAngleQuote] = "foo";
+        options.Mapping[SmartyPantType.RightAngleQuote] = "bar";
 
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseSmartyPants(options)
-                .Build();
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseSmartyPants(options)
+            .Build();
 
-            TestParser.TestSpec("<<test>>", "<p>footestbar</p>", pipeline);
-        }
+        TestParser.TestSpec("<<test>>", "<p>footestbar</p>", pipeline);
+    }
 
-        [Test]
-        public void MappingCanBeReconfigured_HandlesRemovedMappings()
-        {
-            SmartyPantOptions options = new SmartyPantOptions();
-            options.Mapping.Remove(SmartyPantType.LeftAngleQuote);
-            options.Mapping.Remove(SmartyPantType.RightAngleQuote);
+    [Test]
+    public void MappingCanBeReconfigured_HandlesRemovedMappings()
+    {
+        var options = new SmartyPantOptions();
+        options.Mapping.Remove(SmartyPantType.LeftAngleQuote);
+        options.Mapping.Remove(SmartyPantType.RightAngleQuote);
 
-            var pipeline = new MarkdownPipelineBuilder()
-                .UseSmartyPants(options)
-                .Build();
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseSmartyPants(options)
+            .Build();
 
-            TestParser.TestSpec("<<test>>", "<p>&laquo;test&raquo;</p>", pipeline);
-        }
+        TestParser.TestSpec("<<test>>", "<p>&laquo;test&raquo;</p>", pipeline);
     }
 }

src/Markdig.Tests/TestStringSliceList.cs

@@ -1,185 +1,242 @@
-using NUnit.Framework;
+using System.Collections;
 using System.Text;
+
 using Markdig.Helpers;
-using System;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+[TestFixture]
+public class TestStringSliceList
 {
-    [TestFixture]
-    public class TestStringSliceList
+    // TODO: Add tests for StringSlice
+    // TODO: Add more tests for StringLineGroup
+
+    [Test]
+    public void TestStringLineGroupSimple()
     {
-        // TODO: Add tests for StringSlice
-        // TODO: Add more tests for StringLineGroup
-
-        [Test]
-        public void TestStringLineGroupSimple()
+        var text = new StringLineGroup(4)
         {
-            var text = new StringLineGroup(4)
-            {
-                new StringSlice("ABC", NewLine.LineFeed),
-                new StringSlice("E", NewLine.LineFeed),
-                new StringSlice("F")
-            };
+            new StringSlice("ABC", NewLine.LineFeed),
+            new StringSlice("E", NewLine.LineFeed),
+            new StringSlice("F")
+        };
 
-            var iterator = text.ToCharIterator();
-            Assert.AreEqual("ABC\nE\nF".Length, iterator.End - iterator.Start + 1);
+        var iterator = text.ToCharIterator();
+        Assert.AreEqual("ABC\nE\nF".Length, iterator.End - iterator.Start + 1);
 
-            var chars = ToString(text.ToCharIterator());
-            TextAssert.AreEqual("ABC\nE\nF", chars.ToString());
+        var chars = ToString(text.ToCharIterator());
+        TextAssert.AreEqual("ABC\nE\nF", chars.ToString());
 
-            TextAssert.AreEqual("ABC\nE\nF", text.ToString());
-        }
+        TextAssert.AreEqual("ABC\nE\nF", text.ToString());
+    }
 
-        [Test]
-        public void TestStringLineGroupWithSlices()
+    [Test]
+    public void TestStringLineGroupWithSlices()
+    {
+        var text = new StringLineGroup(4)
         {
-            var text = new StringLineGroup(4)
-            {
-                new StringSlice("XABC", NewLine.LineFeed) { Start = 1},
-                new StringSlice("YYE", NewLine.LineFeed) { Start = 2},
-                new StringSlice("ZZZF") { Start = 3 }
-            };
+            new StringSlice("XABC", NewLine.LineFeed) { Start = 1},
+            new StringSlice("YYE", NewLine.LineFeed) { Start = 2},
+            new StringSlice("ZZZF") { Start = 3 }
+        };
 
-            var chars = ToString(text.ToCharIterator());
-            TextAssert.AreEqual("ABC\nE\nF", chars.ToString());
-        }
+        var chars = ToString(text.ToCharIterator());
+        TextAssert.AreEqual("ABC\nE\nF", chars.ToString());
+    }
 
 
-        private static string ToString(StringLineGroup.Iterator text)
+    private static string ToString(StringLineGroup.Iterator text)
+    {
+        var chars = new StringBuilder();
+        while (text.CurrentChar != '\0')
         {
-            var chars = new StringBuilder();
-            while (text.CurrentChar != '\0')
-            {
-                chars.Append(text.CurrentChar);
-                text.NextChar();
-            }
-            return chars.ToString();
-        }
-
-        [Test]
-        public void TestStringLineGroupSaveAndRestore()
-        {
-            var text = new StringLineGroup(4)
-            {
-                new StringSlice("ABCD", NewLine.LineFeed),
-                new StringSlice("EF"),
-            }.ToCharIterator();
-
-            Assert.AreEqual('A', text.CurrentChar);
-            Assert.AreEqual(0, text.SliceIndex);
-
-            text.NextChar(); // B
-
-            text.NextChar(); // C
-            text.NextChar(); // D
-            text.NextChar(); // \n
+            chars.Append(text.CurrentChar);
             text.NextChar();
-            Assert.AreEqual('E', text.CurrentChar);
-            Assert.AreEqual(1, text.SliceIndex);
         }
+        return chars.ToString();
+    }
 
-        [Test]
-        public void TestSkipWhitespaces()
+    [Test]
+    public void TestStringLineGroupSaveAndRestore()
+    {
+        var text = new StringLineGroup(4)
         {
-            var text = new StringLineGroup("             ABC").ToCharIterator();
-            Assert.False(text.TrimStart());
-            Assert.AreEqual('A', text.CurrentChar);
+            new StringSlice("ABCD", NewLine.LineFeed),
+            new StringSlice("EF"),
+        }.ToCharIterator();
 
-            text = new StringLineGroup("        ").ToCharIterator();
-            Assert.True(text.TrimStart());
-            Assert.AreEqual('\0', text.CurrentChar);
+        Assert.AreEqual('A', text.CurrentChar);
+        Assert.AreEqual(0, text.SliceIndex);
 
-            var slice = new StringSlice("             ABC");
-            Assert.False(slice.TrimStart());
+        text.NextChar(); // B
 
-            slice = new StringSlice("        ");
-            Assert.True(slice.TrimStart());
-        }
+        text.NextChar(); // C
+        text.NextChar(); // D
+        text.NextChar(); // \n
+        text.NextChar();
+        Assert.AreEqual('E', text.CurrentChar);
+        Assert.AreEqual(1, text.SliceIndex);
+    }
 
-        [Test]
-        public void TestStringLineGroupWithModifiedStart()
+    [Test]
+    public void TestSkipWhitespaces()
+    {
+        var text = new StringLineGroup("             ABC").ToCharIterator();
+        Assert.False(text.TrimStart());
+        Assert.AreEqual('A', text.CurrentChar);
+
+        text = new StringLineGroup("        ").ToCharIterator();
+        Assert.True(text.TrimStart());
+        Assert.AreEqual('\0', text.CurrentChar);
+
+        var slice = new StringSlice("             ABC");
+        Assert.False(slice.TrimStart());
+
+        slice = new StringSlice("        ");
+        Assert.True(slice.TrimStart());
+    }
+
+    [Test]
+    public void TestStringLineGroupWithModifiedStart()
+    {
+        var line1 = new StringSlice("  ABC", NewLine.LineFeed);
+        line1.NextChar();
+        line1.NextChar();
+
+        var line2 = new StringSlice("  DEF ");
+        line2.Trim();
+
+        var text = new StringLineGroup(4) {line1, line2};
+
+        var result = ToString(text.ToCharIterator());
+        TextAssert.AreEqual("ABC\nDEF", result);
+    }
+
+    [Test]
+    public void TestStringLineGroupWithTrim()
+    {
+        var line1 = new StringSlice("  ABC  ", NewLine.LineFeed);
+        line1.NextChar();
+        line1.NextChar();
+
+        var line2 = new StringSlice("  DEF ");
+
+        var text = new StringLineGroup(4) { line1, line2}.ToCharIterator();
+        text.TrimStart();
+
+        var result = ToString(text);
+        TextAssert.AreEqual("ABC  \n  DEF ", result);
+    }
+
+    [Test]
+    public void TestStringLineGroupIteratorPeekChar()
+    {
+        var iterator = new StringLineGroup(4)
         {
-            var line1 = new StringSlice("  ABC", NewLine.LineFeed);
-            line1.NextChar();
-            line1.NextChar();
+            new StringSlice("ABC", NewLine.LineFeed),
+            new StringSlice("E", NewLine.LineFeed),
+            new StringSlice("F")
+        }.ToCharIterator();
 
-            var line2 = new StringSlice("  DEF ");
-            line2.Trim();
+        Assert.AreEqual('A', iterator.CurrentChar);
+        Assert.AreEqual('A', iterator.PeekChar(0));
+        Assert.AreEqual('B', iterator.PeekChar());
+        Assert.AreEqual('B', iterator.PeekChar(1));
+        Assert.AreEqual('C', iterator.PeekChar(2));
+        Assert.AreEqual('\n', iterator.PeekChar(3));
+        Assert.AreEqual('E', iterator.PeekChar(4));
+        Assert.AreEqual('\n', iterator.PeekChar(5));
+        Assert.AreEqual('F', iterator.PeekChar(6));
+        Assert.AreEqual('\0', iterator.PeekChar(7)); // There is no \n appended to the last line
+        Assert.AreEqual('\0', iterator.PeekChar(8));
+        Assert.AreEqual('\0', iterator.PeekChar(100));
 
-            var text = new StringLineGroup(4) {line1, line2};
+        Assert.Throws<ArgumentOutOfRangeException>(() => iterator.PeekChar(-1));
+    }
 
-            var result = ToString(text.ToCharIterator());
-            TextAssert.AreEqual("ABC\nDEF", result);
-        }
-
-        [Test]
-        public void TestStringLineGroupWithTrim()
+    [Test]
+    public void TestIteratorSkipChar()
+    {
+        var lineGroup = new StringLineGroup(4)
         {
-            var line1 = new StringSlice("  ABC  ", NewLine.LineFeed);
-            line1.NextChar();
-            line1.NextChar();
+            new StringSlice("ABC", NewLine.LineFeed),
+            new StringSlice("E", NewLine.LineFeed)
+        };
 
-            var line2 = new StringSlice("  DEF ");
+        Test(lineGroup.ToCharIterator());
 
-            var text = new StringLineGroup(4) { line1, line2}.ToCharIterator();
-            text.TrimStart();
+        Test(new StringSlice("ABC\nE\n"));
 
-            var result = ToString(text);
-            TextAssert.AreEqual("ABC  \n  DEF ", result);
-        }
+        Test(new StringSlice("Foo\nABC\nE\n", 4, 9));
 
-        [Test]
-        public void TestStringLineGroupIteratorPeekChar()
+        static void Test<T>(T iterator) where T : ICharIterator
         {
-            var iterator = new StringLineGroup(4)
-            {
-                new StringSlice("ABC", NewLine.LineFeed),
-                new StringSlice("E", NewLine.LineFeed),
-                new StringSlice("F")
-            }.ToCharIterator();
-
-            Assert.AreEqual('A', iterator.CurrentChar);
-            Assert.AreEqual('A', iterator.PeekChar(0));
-            Assert.AreEqual('B', iterator.PeekChar());
-            Assert.AreEqual('B', iterator.PeekChar(1));
-            Assert.AreEqual('C', iterator.PeekChar(2));
-            Assert.AreEqual('\n', iterator.PeekChar(3));
-            Assert.AreEqual('E', iterator.PeekChar(4));
-            Assert.AreEqual('\n', iterator.PeekChar(5));
-            Assert.AreEqual('F', iterator.PeekChar(6));
-            Assert.AreEqual('\0', iterator.PeekChar(7)); // There is no \n appended to the last line
-            Assert.AreEqual('\0', iterator.PeekChar(8));
-            Assert.AreEqual('\0', iterator.PeekChar(100));
-
-            Assert.Throws<ArgumentOutOfRangeException>(() => iterator.PeekChar(-1));
-        }
-
-        [Test]
-        public void TestIteratorSkipChar()
-        {
-            var lineGroup = new StringLineGroup(4)
-            {
-                new StringSlice("ABC", NewLine.LineFeed),
-                new StringSlice("E", NewLine.LineFeed)
-            };
-
-            Test(lineGroup.ToCharIterator());
-
-            Test(new StringSlice("ABC\nE\n"));
-
-            Test(new StringSlice("Foo\nABC\nE\n", 4, 9));
-
-            static void Test<T>(T iterator) where T : ICharIterator
-            {
-                Assert.AreEqual('A', iterator.CurrentChar); iterator.SkipChar();
-                Assert.AreEqual('B', iterator.CurrentChar); iterator.SkipChar();
-                Assert.AreEqual('C', iterator.CurrentChar); iterator.SkipChar();
-                Assert.AreEqual('\n', iterator.CurrentChar); iterator.SkipChar();
-                Assert.AreEqual('E', iterator.CurrentChar); iterator.SkipChar();
-                Assert.AreEqual('\n', iterator.CurrentChar); iterator.SkipChar();
-                Assert.AreEqual('\0', iterator.CurrentChar); iterator.SkipChar();
-                Assert.AreEqual('\0', iterator.CurrentChar); iterator.SkipChar();
-            }
+            Assert.AreEqual('A', iterator.CurrentChar); iterator.SkipChar();
+            Assert.AreEqual('B', iterator.CurrentChar); iterator.SkipChar();
+            Assert.AreEqual('C', iterator.CurrentChar); iterator.SkipChar();
+            Assert.AreEqual('\n', iterator.CurrentChar); iterator.SkipChar();
+            Assert.AreEqual('E', iterator.CurrentChar); iterator.SkipChar();
+            Assert.AreEqual('\n', iterator.CurrentChar); iterator.SkipChar();
+            Assert.AreEqual('\0', iterator.CurrentChar); iterator.SkipChar();
+            Assert.AreEqual('\0', iterator.CurrentChar); iterator.SkipChar();
         }
     }
-}
+
+    [Test]
+    public void TestStringLineGroupCharIteratorAtCapacity()
+    {
+        string str = "ABCDEFGHI";
+        var text = new StringLineGroup(1)
+        {
+            // Will store the following line at capacity
+            new StringSlice(str, NewLine.CarriageReturnLineFeed) { Start = 0, End = 2 },
+        };
+
+        var iterator = text.ToCharIterator();
+        var chars = ToString(iterator);
+        TextAssert.AreEqual("ABC\r\n", chars.ToString());
+        TextAssert.AreEqual("ABC", text.ToString());
+    }
+
+    [Test]
+    public void TestStringLineGroupCharIteratorForcingIncreaseCapacity()
+    {
+        string str = "ABCDEFGHI";
+        var text = new StringLineGroup(1)
+        {
+            // Will store the following line at capacity
+            new StringSlice(str, NewLine.CarriageReturnLineFeed) { Start = 0, End = 2 },
+
+            // Will force increase capacity to 2 and store the line at capacity
+            new StringSlice(str, NewLine.CarriageReturnLineFeed) { Start = 3, End = 3 },
+        };
+
+        var iterator = text.ToCharIterator();
+        var chars = ToString(iterator);
+        TextAssert.AreEqual("ABC\r\nD\r\n", chars.ToString());
+        TextAssert.AreEqual("ABC\r\nD", text.ToString());
+    }
+
+    [Test]
+    public void TestStringLineGroup_EnumeratorReturnsRealLines()
+    {
+        string str = "A\r\n";
+        var text = new StringLineGroup(4)
+        {
+            new StringSlice(str, NewLine.CarriageReturnLineFeed) { Start = 0, End = 0 }
+        };
+
+        var enumerator = ((IEnumerable)text).GetEnumerator();
+        Assert.True(enumerator.MoveNext());
+        StringLine currentLine = (StringLine)enumerator.Current;
+        TextAssert.AreEqual("A", currentLine.ToString());
+        Assert.False(enumerator.MoveNext());
+        
+        var nonBoxedEnumerator = text.GetEnumerator();
+
+        Assert.True(nonBoxedEnumerator.MoveNext());
+        currentLine = (StringLine)nonBoxedEnumerator.Current;
+        TextAssert.AreEqual("A", currentLine.ToString());
+        Assert.False(nonBoxedEnumerator.MoveNext());
+    }
+}

src/Markdig.Tests/TestTransformedStringCache.cs

@@ -1,102 +1,98 @@
-using System;
-using System.Linq;
 using Markdig.Helpers;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestTransformedStringCache
 {
-    public class TestTransformedStringCache
+    [Test]
+    public void GetRunsTransformationCallback()
     {
-        [Test]
-        public void GetRunsTransformationCallback()
-        {
-            var cache = new TransformedStringCache(static s => "callback-" + s);
+        var cache = new TransformedStringCache(static s => "callback-" + s);
 
-            Assert.AreEqual("callback-foo", cache.Get("foo"));
-            Assert.AreEqual("callback-bar", cache.Get("bar"));
-            Assert.AreEqual("callback-baz", cache.Get("baz"));
+        Assert.AreEqual("callback-foo", cache.Get("foo"));
+        Assert.AreEqual("callback-bar", cache.Get("bar"));
+        Assert.AreEqual("callback-baz", cache.Get("baz"));
+    }
+
+    [Test]
+    public void CachesTransformedInstance()
+    {
+        var cache = new TransformedStringCache(static s => "callback-" + s);
+
+        string transformedBar = cache.Get("bar");
+        Assert.AreSame(transformedBar, cache.Get("bar"));
+
+        string transformedFoo = cache.Get("foo".AsSpan());
+        Assert.AreSame(transformedFoo, cache.Get("foo"));
+
+        Assert.AreSame(cache.Get("baz"), cache.Get("baz".AsSpan()));
+
+        Assert.AreSame(transformedBar, cache.Get("bar"));
+        Assert.AreSame(transformedFoo, cache.Get("foo"));
+        Assert.AreSame(transformedBar, cache.Get("bar".AsSpan()));
+        Assert.AreSame(transformedFoo, cache.Get("foo".AsSpan()));
+    }
+
+    [Test]
+    public void DoesNotCacheEmptyInputs()
+    {
+        var cache = new TransformedStringCache(static s => new string('a', 4));
+
+        string cached = cache.Get("");
+        string cached2 = cache.Get("");
+        string cached3 = cache.Get(ReadOnlySpan<char>.Empty);
+
+        Assert.AreEqual("aaaa", cached);
+        Assert.AreEqual(cached, cached2);
+        Assert.AreEqual(cached, cached3);
+
+        Assert.AreNotSame(cached, cached2);
+        Assert.AreNotSame(cached, cached3);
+        Assert.AreNotSame(cached2, cached3);
+    }
+
+    [Test]
+    [TestCase(TransformedStringCache.InputLengthLimit, true)]
+    [TestCase(TransformedStringCache.InputLengthLimit + 1, false)]
+    public void DoesNotCacheLongInputs(int length, bool shouldBeCached)
+    {
+        var cache = new TransformedStringCache(static s => "callback-" + s);
+
+        string input = new string('a', length);
+
+        string cached = cache.Get(input);
+        string cached2 = cache.Get(input);
+
+        Assert.AreEqual("callback-" + input, cached);
+        Assert.AreEqual(cached, cached2);
+
+        if (shouldBeCached)
+        {
+            Assert.AreSame(cached, cached2);
         }
-
-        [Test]
-        public void CachesTransformedInstance()
+        else
         {
-            var cache = new TransformedStringCache(static s => "callback-" + s);
-
-            string transformedBar = cache.Get("bar");
-            Assert.AreSame(transformedBar, cache.Get("bar"));
-
-            string transformedFoo = cache.Get("foo".AsSpan());
-            Assert.AreSame(transformedFoo, cache.Get("foo"));
-
-            Assert.AreSame(cache.Get("baz"), cache.Get("baz".AsSpan()));
-
-            Assert.AreSame(transformedBar, cache.Get("bar"));
-            Assert.AreSame(transformedFoo, cache.Get("foo"));
-            Assert.AreSame(transformedBar, cache.Get("bar".AsSpan()));
-            Assert.AreSame(transformedFoo, cache.Get("foo".AsSpan()));
-        }
-
-        [Test]
-        public void DoesNotCacheEmptyInputs()
-        {
-            var cache = new TransformedStringCache(static s => new string('a', 4));
-
-            string cached = cache.Get("");
-            string cached2 = cache.Get("");
-            string cached3 = cache.Get(ReadOnlySpan<char>.Empty);
-
-            Assert.AreEqual("aaaa", cached);
-            Assert.AreEqual(cached, cached2);
-            Assert.AreEqual(cached, cached3);
-
             Assert.AreNotSame(cached, cached2);
-            Assert.AreNotSame(cached, cached3);
-            Assert.AreNotSame(cached2, cached3);
-        }
-
-        [Test]
-        [TestCase(TransformedStringCache.InputLengthLimit, true)]
-        [TestCase(TransformedStringCache.InputLengthLimit + 1, false)]
-        public void DoesNotCacheLongInputs(int length, bool shouldBeCached)
-        {
-            var cache = new TransformedStringCache(static s => "callback-" + s);
-
-            string input = new string('a', length);
-
-            string cached = cache.Get(input);
-            string cached2 = cache.Get(input);
-
-            Assert.AreEqual("callback-" + input, cached);
-            Assert.AreEqual(cached, cached2);
-
-            if (shouldBeCached)
-            {
-                Assert.AreSame(cached, cached2);
-            }
-            else
-            {
-                Assert.AreNotSame(cached, cached2);
-            }
-        }
-
-        [Test]
-        public void CachesAtMostNEntriesPerCharacter()
-        {
-            var cache = new TransformedStringCache(static s => "callback-" + s);
-
-            int limit = TransformedStringCache.MaxEntriesPerCharacter;
-
-            string[] a = Enumerable.Range(1, limit + 1).Select(i => $"a{i}").ToArray();
-            string[] cachedAs = a.Select(a => cache.Get(a)).ToArray();
-
-            for (int i = 0; i < limit; i++)
-            {
-                Assert.AreSame(cachedAs[i], cache.Get(a[i]));
-            }
-
-            Assert.AreNotSame(cachedAs[limit], cache.Get(a[limit]));
-
-            Assert.AreSame(cache.Get("b1"), cache.Get("b1"));
         }
     }
+
+    [Test]
+    public void CachesAtMostNEntriesPerCharacter()
+    {
+        var cache = new TransformedStringCache(static s => "callback-" + s);
+
+        int limit = TransformedStringCache.MaxEntriesPerCharacter;
+
+        string[] a = Enumerable.Range(1, limit + 1).Select(i => $"a{i}").ToArray();
+        string[] cachedAs = a.Select(a => cache.Get(a)).ToArray();
+
+        for (int i = 0; i < limit; i++)
+        {
+            Assert.AreSame(cachedAs[i], cache.Get(a[i]));
+        }
+
+        Assert.AreNotSame(cachedAs[limit], cache.Get(a[limit]));
+
+        Assert.AreSame(cache.Get("b1"), cache.Get("b1"));
+    }
 }

src/Markdig.Tests/TestYamlFrontMatterExtension.cs

@@ -1,78 +1,113 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using Markdig.Extensions.Yaml;
 using Markdig.Renderers;
 using Markdig.Syntax;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+public class TestYamlFrontMatterExtension
 {
-    public class TestYamlFrontMatterExtension
+    [TestCaseSource(nameof(TestCases))]
+    public void ProperYamlFrontMatterRenderersAdded(IMarkdownObjectRenderer[] objectRenderers, bool hasYamlFrontMatterHtmlRenderer, bool hasYamlFrontMatterRoundtripRenderer)
     {
-        [TestCaseSource(nameof(TestCases))]
-        public void ProperYamlFrontMatterRenderersAdded(IMarkdownObjectRenderer[] objectRenderers, bool hasYamlFrontMatterHtmlRenderer, bool hasYamlFrontMatterRoundtripRenderer)
+        var builder = new MarkdownPipelineBuilder();
+        builder.Extensions.Add(new YamlFrontMatterExtension());
+        var markdownRenderer = new DummyRenderer();
+        markdownRenderer.ObjectRenderers.AddRange(objectRenderers);
+        builder.Build().Setup(markdownRenderer);
+        Assert.That(markdownRenderer.ObjectRenderers.Contains<YamlFrontMatterHtmlRenderer>(), Is.EqualTo(hasYamlFrontMatterHtmlRenderer));
+        Assert.That(markdownRenderer.ObjectRenderers.Contains<YamlFrontMatterRoundtripRenderer>(), Is.EqualTo(hasYamlFrontMatterRoundtripRenderer));
+    }
+
+    [Test]
+    public void AllowYamlFrontMatterInMiddleOfDocument()
+    {
+        var pipeline = new MarkdownPipelineBuilder()
+            .Use(new YamlFrontMatterExtension { AllowInMiddleOfDocument = true })
+            .Build();
+
+        TestParser.TestSpec(
+            "This is a text1\n---\nthis: is a frontmatter\n---\nThis is a text2",
+            "<p>This is a text1</p>\n<p>This is a text2</p>",
+            pipeline);
+    }
+
+    private static IEnumerable<TestCaseData> TestCases()
+    {
+        yield return new TestCaseData(new IMarkdownObjectRenderer[]
         {
-            var builder = new MarkdownPipelineBuilder();
-            builder.Extensions.Add(new YamlFrontMatterExtension());
-            var markdownRenderer = new DummyRenderer();
-            markdownRenderer.ObjectRenderers.AddRange(objectRenderers);
-            builder.Build().Setup(markdownRenderer);
-            Assert.That(markdownRenderer.ObjectRenderers.Contains<YamlFrontMatterHtmlRenderer>(), Is.EqualTo(hasYamlFrontMatterHtmlRenderer));
-            Assert.That(markdownRenderer.ObjectRenderers.Contains<YamlFrontMatterRoundtripRenderer>(), Is.EqualTo(hasYamlFrontMatterRoundtripRenderer));
+        }, false, false) {TestName = "No ObjectRenderers"};
+
+        yield return new TestCaseData(new IMarkdownObjectRenderer[]
+        {
+            new Markdig.Renderers.Html.CodeBlockRenderer()
+        }, true, false) {TestName = "Html CodeBlock"};
+
+        yield return new TestCaseData(new IMarkdownObjectRenderer[]
+        {
+            new Markdig.Renderers.Roundtrip.CodeBlockRenderer()
+        }, false, true) {TestName = "Roundtrip CodeBlock"};
+
+        yield return new TestCaseData(new IMarkdownObjectRenderer[]
+        {
+            new Markdig.Renderers.Html.CodeBlockRenderer(),
+            new Markdig.Renderers.Roundtrip.CodeBlockRenderer()
+        }, true, true) {TestName = "Html/Roundtrip CodeBlock"};
+
+        yield return new TestCaseData(new IMarkdownObjectRenderer[]
+        {
+            new Markdig.Renderers.Html.CodeBlockRenderer(),
+            new Markdig.Renderers.Roundtrip.CodeBlockRenderer(),
+            new YamlFrontMatterHtmlRenderer()
+        }, true, true) {TestName = "Html/Roundtrip CodeBlock, Yaml Html"};
+
+        yield return new TestCaseData(new IMarkdownObjectRenderer[]
+        {
+            new Markdig.Renderers.Html.CodeBlockRenderer(),
+            new Markdig.Renderers.Roundtrip.CodeBlockRenderer(),
+            new YamlFrontMatterRoundtripRenderer()
+        }, true, true) { TestName = "Html/Roundtrip CodeBlock, Yaml Roundtrip" };
+    }
+
+    private class DummyRenderer : IMarkdownRenderer
+    {
+        public DummyRenderer()
+        {
+            ObjectRenderers = new ObjectRendererCollection();
         }
 
-        private static IEnumerable<TestCaseData> TestCases()
+#pragma warning disable CS0067 // ObjectWriteBefore/ObjectWriteAfter is never used
+        public event Action<IMarkdownRenderer, MarkdownObject> ObjectWriteBefore;
+        public event Action<IMarkdownRenderer, MarkdownObject> ObjectWriteAfter;
+#pragma warning restore CS0067
+
+        public ObjectRendererCollection ObjectRenderers { get; }
+        public object Render(MarkdownObject markdownObject)
         {
-            yield return new TestCaseData(new IMarkdownObjectRenderer[]
-            {
-            }, false, false) {TestName = "No ObjectRenderers"};
-
-            yield return new TestCaseData(new IMarkdownObjectRenderer[]
-            {
-                new Markdig.Renderers.Html.CodeBlockRenderer()
-            }, true, false) {TestName = "Html CodeBlock"};
-
-            yield return new TestCaseData(new IMarkdownObjectRenderer[]
-            {
-                new Markdig.Renderers.Roundtrip.CodeBlockRenderer()
-            }, false, true) {TestName = "Roundtrip CodeBlock"};
-
-            yield return new TestCaseData(new IMarkdownObjectRenderer[]
-            {
-                new Markdig.Renderers.Html.CodeBlockRenderer(),
-                new Markdig.Renderers.Roundtrip.CodeBlockRenderer()
-            }, true, true) {TestName = "Html/Roundtrip CodeBlock"};
-
-            yield return new TestCaseData(new IMarkdownObjectRenderer[]
-            {
-                new Markdig.Renderers.Html.CodeBlockRenderer(),
-                new Markdig.Renderers.Roundtrip.CodeBlockRenderer(),
-                new YamlFrontMatterHtmlRenderer()
-            }, true, true) {TestName = "Html/Roundtrip CodeBlock, Yaml Html"};
-
-            yield return new TestCaseData(new IMarkdownObjectRenderer[]
-            {
-                new Markdig.Renderers.Html.CodeBlockRenderer(),
-                new Markdig.Renderers.Roundtrip.CodeBlockRenderer(),
-                new YamlFrontMatterRoundtripRenderer()
-            }, true, true) { TestName = "Html/Roundtrip CodeBlock, Yaml Roundtrip" };
-        }
-
-        private class DummyRenderer : IMarkdownRenderer
-        {
-            public DummyRenderer()
-            {
-                ObjectRenderers = new ObjectRendererCollection();
-            }
-
-            public event Action<IMarkdownRenderer, MarkdownObject> ObjectWriteBefore;
-            public event Action<IMarkdownRenderer, MarkdownObject> ObjectWriteAfter;
-            public ObjectRendererCollection ObjectRenderers { get; }
-            public object Render(MarkdownObject markdownObject)
-            {
-                return null;
-            }
+            return null;
         }
     }
+
+    [TestCase("---\nkey1: value1\nkey2: value2\n---\n\n# Content\n")]
+    [TestCase("---\nkey1: value1\nkey2: value2\nkey3: value3\nkey4: value4\nkey5: value5\nkey6: value6\nkey7: value7\nkey8: value8\n---\n\n# Content\n")]
+    public void FrontMatterBlockLinesCharIterator(string value)
+    {
+        var builder = new MarkdownPipelineBuilder();
+        builder.Extensions.Add(new YamlFrontMatterExtension());
+        var markdownDocument = Markdown.Parse(value, builder.Build());
+
+        var yamlBlocks = markdownDocument.Descendants<YamlFrontMatterBlock>();
+        Assert.True(yamlBlocks.Any());
+
+        foreach (var yamlBlock in yamlBlocks)
+        {
+            var iterator = yamlBlock.Lines.ToCharIterator();
+            while(iterator.CurrentChar != '\0')
+            {
+                iterator.NextChar();
+            }
+        }
+
+        // No exception parsing and iterating through YAML front matter block lines
+    }
+
 }

src/Markdig.Tests/TextAssert.cs

@@ -1,119 +1,115 @@
 // Copyright (c) Alexandre Mutel. All rights reserved.
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
-using System;
 using System.Globalization;
-using System.IO;
-using NUnit.Framework;
 
-namespace Markdig.Tests
+namespace Markdig.Tests;
+
+/// <summary>
+/// Pretty text assert from https://gist.github.com/Haacked/1610603
+/// Modified version to only print +-10 characters around the first diff
+/// </summary>
+public static class TextAssert
 {
-    /// <summary>
-    /// Pretty text assert from https://gist.github.com/Haacked/1610603
-    /// Modified version to only print +-10 characters around the first diff
-    /// </summary>
-    public static class TextAssert
+    public enum DiffStyle
     {
-        public enum DiffStyle
+        Full,
+        Minimal
+    }
+
+    public static void AreEqual(string expectedValue, string actualValue)
+    {
+        AreEqual(expectedValue, actualValue, DiffStyle.Full, Console.Out);
+    }
+
+    public static void AreEqual(string expectedValue, string actualValue, DiffStyle diffStyle)
+    {
+        AreEqual(expectedValue, actualValue, diffStyle, Console.Out);
+    }
+
+    public static void AreEqual(string expectedValue, string actualValue, DiffStyle diffStyle, TextWriter output)
+    {
+        if (actualValue == null || expectedValue == null)
         {
-            Full,
-            Minimal
-        }
-
-        public static void AreEqual(string expectedValue, string actualValue)
-        {
-            AreEqual(expectedValue, actualValue, DiffStyle.Full, Console.Out);
-        }
-
-        public static void AreEqual(string expectedValue, string actualValue, DiffStyle diffStyle)
-        {
-            AreEqual(expectedValue, actualValue, diffStyle, Console.Out);
-        }
-
-        public static void AreEqual(string expectedValue, string actualValue, DiffStyle diffStyle, TextWriter output)
-        {
-            if (actualValue == null || expectedValue == null)
-            {
-                Assert.AreEqual(expectedValue, actualValue);
-                return;
-            }
-
-            if (actualValue.Equals(expectedValue, StringComparison.Ordinal))
-            {
-                return;
-            }
-
-            Console.WriteLine();
-            output.WriteLine("Index    Expected     Actual");
-            output.WriteLine("----------------------------");
-            int maxLen = Math.Max(actualValue.Length, expectedValue.Length);
-            int minLen = Math.Min(actualValue.Length, expectedValue.Length);
-
-            if (diffStyle != DiffStyle.Minimal)
-            {
-                int startDifferAt = 0;
-                for (int i = 0; i < maxLen; i++)
-                {
-                    if (i >= minLen || actualValue[i] != expectedValue[i])
-                    {
-                        startDifferAt = i;
-                        break;
-                    }
-                }
-
-                var endDifferAt = Math.Min(startDifferAt + 10, maxLen);
-                startDifferAt = Math.Max(startDifferAt - 10, 0);
-
-                bool isFirstDiff = true;
-                for (int i = startDifferAt; i < endDifferAt; i++)
-                {
-                    if (i >= minLen || actualValue[i] != expectedValue[i])
-                    {
-                        output.WriteLine("{0,-3} {1,-3}    {2,-4} {3,-3}   {4,-4} {5,-3}",
-                            i < minLen && actualValue[i] == expectedValue[i] ? " " : isFirstDiff  ? ">>>": "***",
-                            // put a mark beside a differing row
-                            i, // the index
-                            i < expectedValue.Length ? ((int) expectedValue[i]).ToString() : "",
-                            // character decimal value
-                            i < expectedValue.Length ? expectedValue[i].ToSafeString() : "", // character safe string
-                            i < actualValue.Length ? ((int) actualValue[i]).ToString() : "", // character decimal value
-                            i < actualValue.Length ? actualValue[i].ToSafeString() : "" // character safe string
-                            );
-
-                        isFirstDiff = false;
-                    }
-                }
-                //output.WriteLine();
-            }
-
             Assert.AreEqual(expectedValue, actualValue);
+            return;
         }
 
-        private static string ToSafeString(this char c)
+        if (actualValue.Equals(expectedValue, StringComparison.Ordinal))
         {
-            if (char.IsControl(c) || char.IsWhiteSpace(c))
+            return;
+        }
+
+        Console.WriteLine();
+        output.WriteLine("Index    Expected     Actual");
+        output.WriteLine("----------------------------");
+        int maxLen = Math.Max(actualValue.Length, expectedValue.Length);
+        int minLen = Math.Min(actualValue.Length, expectedValue.Length);
+
+        if (diffStyle != DiffStyle.Minimal)
+        {
+            int startDifferAt = 0;
+            for (int i = 0; i < maxLen; i++)
             {
-                switch (c)
+                if (i >= minLen || actualValue[i] != expectedValue[i])
                 {
-                    case '\b':
-                        return @"\b";
-                    case '\r':
-                        return @"\r";
-                    case '\n':
-                        return @"\n";
-                    case '\t':
-                        return @"\t";
-                    case '\a':
-                        return @"\a";
-                    case '\v':
-                        return @"\v";
-                    case '\f':
-                        return @"\f";
-                    default:
-                        return $"\\u{(int) c:X};";
+                    startDifferAt = i;
+                    break;
                 }
             }
-            return c.ToString(CultureInfo.InvariantCulture);
+
+            var endDifferAt = Math.Min(startDifferAt + 10, maxLen);
+            startDifferAt = Math.Max(startDifferAt - 10, 0);
+
+            bool isFirstDiff = true;
+            for (int i = startDifferAt; i < endDifferAt; i++)
+            {
+                if (i >= minLen || actualValue[i] != expectedValue[i])
+                {
+                    output.WriteLine("{0,-3} {1,-3}    {2,-4} {3,-3}   {4,-4} {5,-3}",
+                        i < minLen && actualValue[i] == expectedValue[i] ? " " : isFirstDiff  ? ">>>": "***",
+                        // put a mark beside a differing row
+                        i, // the index
+                        i < expectedValue.Length ? ((int) expectedValue[i]).ToString() : "",
+                        // character decimal value
+                        i < expectedValue.Length ? expectedValue[i].ToSafeString() : "", // character safe string
+                        i < actualValue.Length ? ((int) actualValue[i]).ToString() : "", // character decimal value
+                        i < actualValue.Length ? actualValue[i].ToSafeString() : "" // character safe string
+                        );
+
+                    isFirstDiff = false;
+                }
+            }
+            //output.WriteLine();
         }
+
+        Assert.AreEqual(expectedValue, actualValue);
+    }
+
+    private static string ToSafeString(this char c)
+    {
+        if (char.IsControl(c) || char.IsWhiteSpace(c))
+        {
+            switch (c)
+            {
+                case '\b':
+                    return @"\b";
+                case '\r':
+                    return @"\r";
+                case '\n':
+                    return @"\n";
+                case '\t':
+                    return @"\t";
+                case '\a':
+                    return @"\a";
+                case '\v':
+                    return @"\v";
+                case '\f':
+                    return @"\f";
+                default:
+                    return $"\\u{(int) c:X};";
+            }
+        }
+        return c.ToString(CultureInfo.InvariantCulture);
     }
 }

src/Markdig.WebApp/ApiController.cs

@@ -1,55 +1,54 @@
-using System;
 using System.Text;
+
 using Microsoft.AspNetCore.Mvc;
 
-namespace Markdig.WebApp
+namespace Markdig.WebApp;
+
+public class ApiController : Controller
 {
-    public class ApiController : Controller
+    [HttpGet()]
+    [Route("")]
+    public new string Empty()
     {
-        [HttpGet()]
-        [Route("")]
-        public string Empty()
+        return string.Empty;
+    }
+
+    // GET api/to_html?text=xxx&extension=advanced
+    [Route("api/to_html")]
+    [HttpGet()]
+    public object Get([FromQuery] string text, [FromQuery] string extension)
+    {
+        try
         {
-            return string.Empty;
+            if (text == null)
+            {
+                text = string.Empty;
+            }
+
+            if (text.Length > 1000)
+            {
+                text = text.Substring(0, 1000);
+            }
+
+            var pipeline = new MarkdownPipelineBuilder().Configure(extension).Build();
+            var result = Markdown.ToHtml(text, pipeline);
+
+            return new {name = "markdig", html = result, version = Markdown.Version};
         }
-
-        // GET api/to_html?text=xxx&extension=advanced
-        [Route("api/to_html")]
-        [HttpGet()]
-        public object Get([FromQuery] string text, [FromQuery] string extension)
+        catch (Exception ex)
         {
-            try
-            {
-                if (text == null)
-                {
-                    text = string.Empty;
-                }
-
-                if (text.Length > 1000)
-                {
-                    text = text.Substring(0, 1000);
-                }
-
-                var pipeline = new MarkdownPipelineBuilder().Configure(extension).Build();
-                var result = Markdown.ToHtml(text, pipeline);
-
-                return new {name = "markdig", html = result, version = Markdown.Version};
-            }
-            catch (Exception ex)
-            {
-                return new { name = "markdig", html = "exception: " + GetPrettyMessageFromException(ex), version = Markdown.Version };
-            }
-        }
-
-        private static string GetPrettyMessageFromException(Exception exception)
-        {
-            var builder = new StringBuilder();
-            while (exception != null)
-            {
-                builder.Append(exception.Message);
-                exception = exception.InnerException;
-            }
-            return builder.ToString();
+            return new { name = "markdig", html = "exception: " + GetPrettyMessageFromException(ex), version = Markdown.Version };
         }
     }
+
+    private static string GetPrettyMessageFromException(Exception exception)
+    {
+        var builder = new StringBuilder();
+        while (exception != null)
+        {
+            builder.Append(exception.Message);
+            exception = exception.InnerException;
+        }
+        return builder.ToString();
+    }
 }

src/Markdig.WebApp/Markdig.WebApp.csproj

@@ -1,9 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <PreserveCompilationContext>true</PreserveCompilationContext>
     <AssemblyName>Markdig.WebApp</AssemblyName>
+    <ImplicitUsings>enable</ImplicitUsings>
     <OutputType>Exe</OutputType>
     <PackageId>Markdig.WebApp</PackageId>
     <ApplicationInsightsResourceId>/subscriptions/b6745039-70e7-4641-994b-5457cb220e2a/resourcegroups/Default-ApplicationInsights-EastUS/providers/microsoft.insights/components/Markdig.WebApp</ApplicationInsightsResourceId>
@@ -13,7 +14,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.20.0" />
+    <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.22.0" />
   </ItemGroup>
 
   <ItemGroup>

src/Markdig.WebApp/Program.cs

@@ -1,22 +1,16 @@
-using System.IO;
-using Microsoft.AspNetCore.Hosting;
-using Microsoft.AspNetCore.Builder;
-using Microsoft.Extensions.Hosting;
+namespace Markdig.WebApp;
 
-namespace Markdig.WebApp
+public class Program
 {
-    public class Program
+    public static void Main(string[] args)
     {
-        public static void Main(string[] args)
-        {
-            CreateHostBuilder(args).Build().Run();
-        }
-
-        public static IHostBuilder CreateHostBuilder(string[] args) =>
-            Host.CreateDefaultBuilder(args)
-                .ConfigureWebHostDefaults(webBuilder =>
-                {
-                    webBuilder.UseStartup<Startup>();
-                });
+        CreateHostBuilder(args).Build().Run();
     }
+
+    public static IHostBuilder CreateHostBuilder(string[] args) =>
+        Host.CreateDefaultBuilder(args)
+            .ConfigureWebHostDefaults(webBuilder =>
+            {
+                webBuilder.UseStartup<Startup>();
+            });
 }

src/Markdig.WebApp/Startup.cs

@@ -1,60 +1,52 @@
-using Microsoft.AspNetCore.Builder;
-using Microsoft.AspNetCore.Hosting;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-using Microsoft.Extensions.Logging;
+namespace Markdig.WebApp;
 
-namespace Markdig.WebApp
+public class Startup
 {
-    public class Startup
+    public Startup(IWebHostEnvironment env)
     {
-        public Startup(IWebHostEnvironment env)
+        var builder = new ConfigurationBuilder()
+            .SetBasePath(env.ContentRootPath)
+            .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
+            .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);
+
+        if (env.IsEnvironment("Development"))
         {
-            var builder = new ConfigurationBuilder()
-                .SetBasePath(env.ContentRootPath)
-                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
-                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);
-
-            if (env.IsEnvironment("Development"))
-            {
-                // This will push telemetry data through Application Insights pipeline faster, allowing you to view results immediately.
-                builder.AddApplicationInsightsSettings(developerMode: true);
-            }
-
-            builder.AddEnvironmentVariables();
-            Configuration = builder.Build();
+            // This will push telemetry data through Application Insights pipeline faster, allowing you to view results immediately.
+            builder.AddApplicationInsightsSettings(connectionString: null, developerMode: true);
         }
 
-        public IConfigurationRoot Configuration { get; }
+        builder.AddEnvironmentVariables();
+        Configuration = builder.Build();
+    }
 
-        // This method gets called by the runtime. Use this method to add services to the container
-        public void ConfigureServices(IServiceCollection services)
+    public IConfigurationRoot Configuration { get; }
+
+    // This method gets called by the runtime. Use this method to add services to the container
+    public void ConfigureServices(IServiceCollection services)
+    {
+        services.AddControllers();
+        
+        // Add framework services.
+        services.AddApplicationInsightsTelemetry(Configuration);
+    }
+
+    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline
+    public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory)
+    {
+        if (env.IsDevelopment())
         {
-            services.AddControllers();
-            
-            // Add framework services.
-            services.AddApplicationInsightsTelemetry(Configuration);
+            app.UseDeveloperExceptionPage();
         }
 
-        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline
-        public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILoggerFactory loggerFactory)
+        app.UseHttpsRedirection();
+
+        app.UseRouting();
+
+        app.UseAuthorization();
+
+        app.UseEndpoints(endpoints =>
         {
-            if (env.IsDevelopment())
-            {
-                app.UseDeveloperExceptionPage();
-            }
-
-            app.UseHttpsRedirection();
-
-            app.UseRouting();
-
-            app.UseAuthorization();
-
-            app.UseEndpoints(endpoints =>
-            {
-                endpoints.MapControllers();
-            });
-        }
+            endpoints.MapControllers();
+        });
     }
 }

src/Markdig/Extensions/Abbreviations/Abbreviation.cs

@@ -7,36 +7,35 @@ using Markdig.Helpers;
 using Markdig.Parsers;
 using Markdig.Syntax;
 
-namespace Markdig.Extensions.Abbreviations
+namespace Markdig.Extensions.Abbreviations;
+
+/// <summary>
+/// An abbreviation object stored at the document level. See extension methods in <see cref="AbbreviationHelper"/>.
+/// </summary>
+/// <seealso cref="LeafBlock" />
+[DebuggerDisplay("Abbr {Label} => {Text}")]
+public class Abbreviation : LeafBlock
 {
     /// <summary>
-    /// An abbreviation object stored at the document level. See extension methods in <see cref="AbbreviationHelper"/>.
+    /// Initializes a new instance of the <see cref="Abbreviation"/> class.
     /// </summary>
-    /// <seealso cref="LeafBlock" />
-    [DebuggerDisplay("Abbr {Label} => {Text}")]
-    public class Abbreviation : LeafBlock
+    /// <param name="parser">The parser used to create this block.</param>
+    public Abbreviation(BlockParser parser) : base(parser)
     {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="Abbreviation"/> class.
-        /// </summary>
-        /// <param name="parser">The parser used to create this block.</param>
-        public Abbreviation(BlockParser parser) : base(parser)
-        {
-        }
-
-        /// <summary>
-        /// Gets or sets the label.
-        /// </summary>
-        public string? Label { get; set; }
-
-        /// <summary>
-        /// The text associated to this label.
-        /// </summary>
-        public StringSlice Text;
-
-        /// <summary>
-        /// The label span
-        /// </summary>
-        public SourceSpan LabelSpan;
     }
+
+    /// <summary>
+    /// Gets or sets the label.
+    /// </summary>
+    public string? Label { get; set; }
+
+    /// <summary>
+    /// The text associated to this label.
+    /// </summary>
+    public StringSlice Text;
+
+    /// <summary>
+    /// The label span
+    /// </summary>
+    public SourceSpan LabelSpan;
 }

src/Markdig/Extensions/Abbreviations/AbbreviationExtension.cs

@@ -4,26 +4,25 @@
 
 using Markdig.Renderers;
 
-namespace Markdig.Extensions.Abbreviations
-{
-    /// <summary>
-    /// Extension to allow abbreviations.
-    /// </summary>
-    /// <seealso cref="IMarkdownExtension" />
-    public class AbbreviationExtension : IMarkdownExtension
-    {
-        public void Setup(MarkdownPipelineBuilder pipeline)
-        {
-            pipeline.BlockParsers.AddIfNotAlready<AbbreviationParser>();
-        }
+namespace Markdig.Extensions.Abbreviations;
 
-        public void Setup(MarkdownPipeline pipeline, IMarkdownRenderer renderer)
+/// <summary>
+/// Extension to allow abbreviations.
+/// </summary>
+/// <seealso cref="IMarkdownExtension" />
+public class AbbreviationExtension : IMarkdownExtension
+{
+    public void Setup(MarkdownPipelineBuilder pipeline)
+    {
+        pipeline.BlockParsers.AddIfNotAlready<AbbreviationParser>();
+    }
+
+    public void Setup(MarkdownPipeline pipeline, IMarkdownRenderer renderer)
+    {
+        if (renderer is HtmlRenderer htmlRenderer && !htmlRenderer.ObjectRenderers.Contains<HtmlAbbreviationRenderer>())
         {
-            if (renderer is HtmlRenderer htmlRenderer && !htmlRenderer.ObjectRenderers.Contains<HtmlAbbreviationRenderer>())
-            {
-                // Must be inserted before CodeBlockRenderer
-                htmlRenderer.ObjectRenderers.Insert(0, new HtmlAbbreviationRenderer());
-            }
+            // Must be inserted before CodeBlockRenderer
+            htmlRenderer.ObjectRenderers.Insert(0, new HtmlAbbreviationRenderer());
         }
     }
 }

src/Markdig/Extensions/Abbreviations/AbbreviationHelper.cs

@@ -2,42 +2,40 @@
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
 
-using System.Collections.Generic;
 using Markdig.Helpers;
 using Markdig.Syntax;
 
-namespace Markdig.Extensions.Abbreviations
+namespace Markdig.Extensions.Abbreviations;
+
+/// <summary>
+/// Extension methods for <see cref="Abbreviation"/>.
+/// </summary>
+public static class AbbreviationHelper
 {
-    /// <summary>
-    /// Extension methods for <see cref="Abbreviation"/>.
-    /// </summary>
-    public static class AbbreviationHelper
+    private static readonly object DocumentKey = typeof (Abbreviation);
+
+    public static bool HasAbbreviations(this MarkdownDocument document)
     {
-        private static readonly object DocumentKey = typeof (Abbreviation);
+        return document.GetAbbreviations() != null;
+    }
 
-        public static bool HasAbbreviations(this MarkdownDocument document)
+    public static void AddAbbreviation(this MarkdownDocument document, string label, Abbreviation abbr)
+    {
+        if (document is null) ThrowHelper.ArgumentNullException(nameof(document));
+        if (label is null) ThrowHelper.ArgumentNullException_label();
+        if (abbr is null) ThrowHelper.ArgumentNullException(nameof(abbr));
+
+        var map = document.GetAbbreviations();
+        if (map is null)
         {
-            return document.GetAbbreviations() != null;
+            map = new Dictionary<string, Abbreviation>();
+            document.SetData(DocumentKey, map);
         }
+        map[label] = abbr;
+    }
 
-        public static void AddAbbreviation(this MarkdownDocument document, string label, Abbreviation abbr)
-        {
-            if (document is null) ThrowHelper.ArgumentNullException(nameof(document));
-            if (label is null) ThrowHelper.ArgumentNullException_label();
-            if (abbr is null) ThrowHelper.ArgumentNullException(nameof(abbr));
-
-            var map = document.GetAbbreviations();
-            if (map is null)
-            {
-                map = new Dictionary<string, Abbreviation>();
-                document.SetData(DocumentKey, map);
-            }
-            map[label] = abbr;
-        }
-
-        public static Dictionary<string, Abbreviation>? GetAbbreviations(this MarkdownDocument document)
-        {
-            return document.GetData(DocumentKey) as Dictionary<string, Abbreviation>;
-        }
+    public static Dictionary<string, Abbreviation>? GetAbbreviations(this MarkdownDocument document)
+    {
+        return document.GetData(DocumentKey) as Dictionary<string, Abbreviation>;
     }
 }

src/Markdig/Extensions/Abbreviations/AbbreviationInline.cs

@@ -5,24 +5,23 @@
 using System.Diagnostics;
 using Markdig.Syntax.Inlines;
 
-namespace Markdig.Extensions.Abbreviations
+namespace Markdig.Extensions.Abbreviations;
+
+/// <summary>
+/// The inline abbreviation.
+/// </summary>
+/// <seealso cref="LeafInline" />
+[DebuggerDisplay("{Abbreviation}")]
+public class AbbreviationInline : LeafInline
 {
     /// <summary>
-    /// The inline abbreviation.
+    /// Initializes a new instance of the <see cref="AbbreviationInline"/> class.
     /// </summary>
-    /// <seealso cref="LeafInline" />
-    [DebuggerDisplay("{Abbreviation}")]
-    public class AbbreviationInline : LeafInline
+    /// <param name="abbreviation">The abbreviation.</param>
+    public AbbreviationInline(Abbreviation abbreviation)
     {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="AbbreviationInline"/> class.
-        /// </summary>
-        /// <param name="abbreviation">The abbreviation.</param>
-        public AbbreviationInline(Abbreviation abbreviation)
-        {
-            Abbreviation = abbreviation;
-        }
-
-        public Abbreviation Abbreviation { get; set; }
+        Abbreviation = abbreviation;
     }
+
+    public Abbreviation Abbreviation { get; set; }
 }

src/Markdig/Extensions/Abbreviations/AbbreviationParser.cs

@@ -2,225 +2,220 @@
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
 
-using System;
-using System.Collections.Generic;
 using Markdig.Helpers;
 using Markdig.Parsers;
 using Markdig.Syntax;
 using Markdig.Syntax.Inlines;
 
-namespace Markdig.Extensions.Abbreviations
+namespace Markdig.Extensions.Abbreviations;
+
+/// <summary>
+/// A block parser for abbreviations.
+/// </summary>
+/// <seealso cref="BlockParser" />
+public class AbbreviationParser : BlockParser
 {
     /// <summary>
-    /// A block parser for abbreviations.
+    /// Initializes a new instance of the <see cref="AbbreviationParser"/> class.
     /// </summary>
-    /// <seealso cref="BlockParser" />
-    public class AbbreviationParser : BlockParser
+    public AbbreviationParser()
     {
-        /// <summary>
-        /// Initializes a new instance of the <see cref="AbbreviationParser"/> class.
-        /// </summary>
-        public AbbreviationParser()
+        OpeningCharacters = ['*'];
+    }
+
+    public override BlockState TryOpen(BlockProcessor processor)
+    {
+        if (processor.IsCodeIndent)
         {
-            OpeningCharacters = new[] { '*' };
+            return BlockState.None;
         }
 
-        public override BlockState TryOpen(BlockProcessor processor)
+        // A link must be of the form *[Some Text]: An abbreviation 
+        var slice = processor.Line;
+        var startPosition = slice.Start;
+        var c = slice.NextChar();
+        if (c != '[')
         {
-            if (processor.IsCodeIndent)
-            {
-                return BlockState.None;
-            }
-
-            // A link must be of the form *[Some Text]: An abbreviation 
-            var slice = processor.Line;
-            var startPosition = slice.Start;
-            var c = slice.NextChar();
-            if (c != '[')
-            {
-                return BlockState.None;
-            }
-
-            if (!LinkHelper.TryParseLabel(ref slice, out string? label, out SourceSpan labelSpan))
-            {
-                return BlockState.None;
-            }
-
-            c = slice.CurrentChar;
-            if (c != ':')
-            {
-                return BlockState.None;
-            }
-            slice.SkipChar();
-
-            slice.Trim();
-
-            var abbr = new Abbreviation(this)
-            {
-                Label = label,
-                Text = slice,
-                Span = new SourceSpan(startPosition, slice.End),
-                Line = processor.LineIndex,
-                Column = processor.Column,
-                LabelSpan = labelSpan,
-            };
-            if (!processor.Document.HasAbbreviations())
-            {
-                processor.Document.ProcessInlinesBegin += DocumentOnProcessInlinesBegin;
-            }
-            processor.Document.AddAbbreviation(abbr.Label, abbr);
-
-            return BlockState.BreakDiscard;
+            return BlockState.None;
         }
 
-        private void DocumentOnProcessInlinesBegin(InlineProcessor inlineProcessor, Inline? inline)
+        if (!LinkHelper.TryParseLabel(ref slice, out string? label, out SourceSpan labelSpan))
         {
-            inlineProcessor.Document.ProcessInlinesBegin -= DocumentOnProcessInlinesBegin;
+            return BlockState.None;
+        }
 
-            var abbreviations = inlineProcessor.Document.GetAbbreviations();
-            // Should not happen, but another extension could decide to remove them, so...
-            if (abbreviations is null)
+        c = slice.CurrentChar;
+        if (c != ':')
+        {
+            return BlockState.None;
+        }
+        slice.SkipChar();
+
+        slice.Trim();
+
+        var abbr = new Abbreviation(this)
+        {
+            Label = label,
+            Text = slice,
+            Span = new SourceSpan(startPosition, slice.End),
+            Line = processor.LineIndex,
+            Column = processor.Column,
+            LabelSpan = labelSpan,
+        };
+        if (!processor.Document.HasAbbreviations())
+        {
+            processor.Document.ProcessInlinesBegin += DocumentOnProcessInlinesBegin;
+        }
+        processor.Document.AddAbbreviation(abbr.Label, abbr);
+
+        return BlockState.BreakDiscard;
+    }
+
+    private void DocumentOnProcessInlinesBegin(InlineProcessor inlineProcessor, Inline? inline)
+    {
+        inlineProcessor.Document.ProcessInlinesBegin -= DocumentOnProcessInlinesBegin;
+
+        var abbreviations = inlineProcessor.Document.GetAbbreviations();
+        // Should not happen, but another extension could decide to remove them, so...
+        if (abbreviations is null)
+        {
+            return;
+        }
+
+        // Build a text matcher from the abbreviations labels
+        var prefixTree = new CompactPrefixTree<Abbreviation>(abbreviations);
+
+        inlineProcessor.LiteralInlineParser.PostMatch += (InlineProcessor processor, ref StringSlice slice) =>
+        {
+            var literal = (LiteralInline)processor.Inline!;
+            var originalLiteral = literal;
+            var originalSpanEnd = literal.Span.End;
+
+            ContainerInline? container = null;
+
+            // This is slow, but we don't have much the choice
+            var content = literal.Content;
+            var text = content.Text;
+
+            for (int i = content.Start; i <= content.End; i++)
             {
-                return;
-            }
-
-            // Build a text matcher from the abbreviations labels
-            var prefixTree = new CompactPrefixTree<Abbreviation>(abbreviations);
-
-            inlineProcessor.LiteralInlineParser.PostMatch += (InlineProcessor processor, ref StringSlice slice) =>
-            {
-                var literal = (LiteralInline)processor.Inline!;
-                var originalLiteral = literal;
-
-                ContainerInline? container = null;
-
-                // This is slow, but we don't have much the choice
-                var content = literal.Content;
-                var text = content.Text;
-
-                for (int i = content.Start; i <= content.End; i++)
+                // Abbreviation must be a whole word == start at the start of a line or after a whitespace
+                if (i != 0)
                 {
-                    // Abbreviation must be a whole word == start at the start of a line or after a whitespace
-                    if (i != 0)
+                    for (i = i - 1; i <= content.End; i++)
                     {
-                        for (i = i - 1; i <= content.End; i++)
+                        if (text[i].IsWhitespace())
                         {
-                            if (text[i].IsWhitespace())
-                            {
-                                i++;
-                                goto ValidAbbreviationStart;
-                            }
+                            i++;
+                            goto ValidAbbreviationStart;
                         }
-                        break;
-                    }
-
-                ValidAbbreviationStart:;
-
-                    if (prefixTree.TryMatchLongest(text.AsSpan(i, content.End - i + 1), out KeyValuePair<string, Abbreviation> abbreviationMatch))
-                    {
-                        var match = abbreviationMatch.Key;
-                        if (!IsValidAbbreviationEnding(match, content, i))
-                        {
-                            continue;
-                        }
-
-                        var indexAfterMatch = i + match.Length;
-
-                        // If we don't have a container, create a new one
-                        if (container is null)
-                        {
-                            container = literal.Parent ??
-                                new ContainerInline
-                                {
-                                    Span = originalLiteral.Span,
-                                    Line = originalLiteral.Line,
-                                    Column = originalLiteral.Column,
-                                };
-                        }
-
-                        var abbrInline = new AbbreviationInline(abbreviationMatch.Value)
-                        {
-                            Span =
-                            {
-                                Start = processor.GetSourcePosition(i, out int line, out int column),
-                            },
-                            Line = line,
-                            Column = column
-                        };
-                        abbrInline.Span.End = abbrInline.Span.Start + match.Length - 1;
-
-                        // Append the previous literal
-                        if (i > content.Start && literal.Parent is null)
-                        {
-                            container.AppendChild(literal);
-                        }
-
-                        literal.Span.End = abbrInline.Span.Start - 1;
-                        // Truncate it before the abbreviation
-                        literal.Content.End = i - 1;
-
-
-                        // Append the abbreviation
-                        container.AppendChild(abbrInline);
-
-                        // If this is the end of the string, clear the literal and exit
-                        if (content.End == indexAfterMatch - 1)
-                        {
-                            literal = null;
-                            break;
-                        }
-
-                        // Process the remaining literal
-                        literal = new LiteralInline()
-                        {
-                            Span = new SourceSpan(abbrInline.Span.End + 1, literal.Span.End),
-                            Line = line,
-                            Column = column + match.Length,
-                        };
-                        content.Start = indexAfterMatch;
-                        literal.Content = content;
-
-                        i = indexAfterMatch - 1;
                     }
+                    break;
                 }
 
-                if (container != null)
+            ValidAbbreviationStart:;
+
+                if (prefixTree.TryMatchLongest(text.AsSpan(i, content.End - i + 1), out KeyValuePair<string, Abbreviation> abbreviationMatch))
                 {
-                    if (literal != null)
+                    var match = abbreviationMatch.Key;
+                    if (!IsValidAbbreviationEnding(match, content, i))
+                    {
+                        continue;
+                    }
+
+                    var indexAfterMatch = i + match.Length;
+
+                    // If we don't have a container, create a new one
+                    if (container is null)
+                    {
+                        container = literal.Parent ??
+                            new ContainerInline
+                            {
+                                Span = originalLiteral.Span,
+                                Line = originalLiteral.Line,
+                                Column = originalLiteral.Column,
+                            };
+                    }
+
+                    var abbrInline = new AbbreviationInline(abbreviationMatch.Value)
+                    {
+                        Span =
+                        {
+                            Start = processor.GetSourcePosition(i, out int line, out int column),
+                        },
+                        Line = line,
+                        Column = column
+                    };
+                    abbrInline.Span.End = abbrInline.Span.Start + match.Length - 1;
+
+                    // Append the previous literal
+                    if (i > content.Start && literal.Parent is null)
                     {
                         container.AppendChild(literal);
                     }
-                    processor.Inline = container;
-                }
-            };
-        }
 
-        private static bool IsValidAbbreviationEnding(string match, StringSlice content, int matchIndex)
-        {
-            // This will check if the next char at the end of the StringSlice is whitespace, punctuation or \0.
-            var contentNew = content;
-            contentNew.End = content.End + 1;
-            int index = matchIndex + match.Length;
-            while (index <= contentNew.End)
-            {
-                var c = contentNew.PeekCharAbsolute(index);
-                if (!(c == '\0' || c.IsWhitespace() || c.IsAsciiPunctuation()))
-                {
-                    return false;
-                }
+                    literal.Span.End = abbrInline.Span.Start - 1;
+                    // Truncate it before the abbreviation
+                    literal.Content.End = i - 1;
 
-                if (c.IsAlphaNumeric())
-                {
-                    return false;
-                }
 
-                if (c.IsWhitespace())
-                {
-                    break;
+                    // Append the abbreviation
+                    container.AppendChild(abbrInline);
+
+                    // If this is the end of the string, clear the literal and exit
+                    if (content.End == indexAfterMatch - 1)
+                    {
+                        literal = null;
+                        break;
+                    }
+
+                    // Process the remaining literal
+                    literal = new LiteralInline()
+                    {
+                        Span = new SourceSpan(abbrInline.Span.End + 1, originalSpanEnd),
+                        Line = line,
+                        Column = column + match.Length,
+                    };
+                    content.Start = indexAfterMatch;
+                    literal.Content = content;
+
+                    i = indexAfterMatch - 1;
                 }
-                index++;
             }
-            return true;
+
+            if (container != null)
+            {
+                if (literal != null)
+                {
+                    container.AppendChild(literal);
+                }
+                processor.Inline = container;
+            }
+        };
+    }
+
+    private static bool IsValidAbbreviationEnding(string match, StringSlice content, int matchIndex)
+    {
+        // This will check if the next char at the end of the StringSlice is whitespace, punctuation or \0.
+        var contentNew = content;
+        contentNew.End = content.End + 1;
+        int index = matchIndex + match.Length;
+        while (index <= contentNew.End)
+        {
+            var c = contentNew.PeekCharAbsolute(index);
+
+            if (c.IsWhitespace())
+            {
+                break;
+            }
+
+            if (!c.IsAsciiPunctuationOrZero())
+            {
+                return false;
+            }
+
+            index++;
         }
+        return true;
     }
 }

src/Markdig/Extensions/Abbreviations/HtmlAbbreviationRenderer.cs

@@ -5,27 +5,26 @@
 using Markdig.Renderers;
 using Markdig.Renderers.Html;
 
-namespace Markdig.Extensions.Abbreviations
+namespace Markdig.Extensions.Abbreviations;
+
+/// <summary>
+/// A HTML renderer for a <see cref="AbbreviationInline"/>.
+/// </summary>
+/// <seealso cref="HtmlObjectRenderer{CustomContainer}" />
+public class HtmlAbbreviationRenderer : HtmlObjectRenderer<AbbreviationInline>
 {
-    /// <summary>
-    /// A HTML renderer for a <see cref="AbbreviationInline"/>.
-    /// </summary>
-    /// <seealso cref="HtmlObjectRenderer{CustomContainer}" />
-    public class HtmlAbbreviationRenderer : HtmlObjectRenderer<AbbreviationInline>
+    protected override void Write(HtmlRenderer renderer, AbbreviationInline obj)
     {
-        protected override void Write(HtmlRenderer renderer, AbbreviationInline obj)
+        // <abbr title="Hyper Text Markup Language">HTML</abbr>
+        var abbr = obj.Abbreviation;
+        if (renderer.EnableHtmlForInline)
         {
-            // <abbr title="Hyper Text Markup Language">HTML</abbr>
-            var abbr = obj.Abbreviation;
-            if (renderer.EnableHtmlForInline)
-            {
-                renderer.Write("<abbr").WriteAttributes(obj).Write(" title=\"").WriteEscape(ref abbr.Text).Write("\">");
-            }
-            renderer.Write(abbr.Label);
-            if (renderer.EnableHtmlForInline)
-            {
-                renderer.Write("</abbr>");
-            }
+            renderer.Write("<abbr").WriteAttributes(obj).Write(" title=\"").WriteEscape(ref abbr.Text).Write("\">");
+        }
+        renderer.Write(abbr.Label);
+        if (renderer.EnableHtmlForInline)
+        {
+            renderer.Write("</abbr>");
         }
     }
 }

src/Markdig/Extensions/Alerts/AlertBlock.cs

@@ -0,0 +1,33 @@
+// Copyright (c) Alexandre Mutel. All rights reserved.
+// This file is licensed under the BSD-Clause 2 license.
+// See the license.txt file in the project root for more information.
+
+using Markdig.Helpers;
+using Markdig.Syntax;
+
+namespace Markdig.Extensions.Alerts;
+
+/// <summary>
+/// A block representing an alert quote block.
+/// </summary>
+public class AlertBlock : QuoteBlock
+{
+    /// <summary>
+    /// Creates a new instance of this block.
+    /// </summary>
+    /// <param name="kind"></param>
+    public AlertBlock(StringSlice kind) : base(null)
+    {
+        Kind = kind;
+    }
+
+    /// <summary>
+    /// Gets or sets the kind of the alert block (e.g `NOTE`, `TIP`, `IMPORTANT`, `WARNING`, `CAUTION`).
+    /// </summary>
+    public StringSlice Kind { get; set; }
+
+    /// <summary>
+    /// Gets or sets the trivia space after the kind.
+    /// </summary>
+    public StringSlice TriviaSpaceAfterKind { get; set; }
+}

src/Markdig/Extensions/Alerts/AlertBlockRenderer.cs

@@ -0,0 +1,86 @@
+// Copyright (c) Alexandre Mutel. All rights reserved.
+// This file is licensed under the BSD-Clause 2 license.
+// See the license.txt file in the project root for more information.
+
+using Markdig.Helpers;
+using Markdig.Renderers;
+using Markdig.Renderers.Html;
+
+namespace Markdig.Extensions.Alerts;
+
+/// <summary>
+/// A HTML renderer for a <see cref="AlertBlock"/>.
+/// </summary>
+/// <seealso cref="HtmlObjectRenderer{AlertBlock}" />
+public class AlertBlockRenderer : HtmlObjectRenderer<AlertBlock>
+{
+    /// <summary>
+    /// Creates a new instance of this renderer.
+    /// </summary>
+    public AlertBlockRenderer()
+    {
+        RenderKind = DefaultRenderKind;
+    }
+
+    /// <summary>
+    /// Gets of sets a delegate to render the kind of the alert.
+    /// </summary>
+    public Action<HtmlRenderer, StringSlice> RenderKind { get; set; }
+
+
+    /// <inheritdoc />
+    protected override void Write(HtmlRenderer renderer, AlertBlock obj)
+    {
+        renderer.EnsureLine();
+        if (renderer.EnableHtmlForBlock)
+        {
+            renderer.Write("<div");
+            renderer.WriteAttributes(obj);
+            renderer.WriteLine('>');
+        }
+
+        RenderKind(renderer, obj.Kind);
+
+        var savedImplicitParagraph = renderer.ImplicitParagraph;
+        renderer.ImplicitParagraph = false;
+        renderer.WriteChildren(obj);
+        renderer.ImplicitParagraph = savedImplicitParagraph;
+        if (renderer.EnableHtmlForBlock)
+        {
+            renderer.WriteLine("</div>");
+        }
+
+        renderer.EnsureLine();
+    }
+
+
+    /// <summary>
+    /// Renders the kind of the alert.
+    /// </summary>
+    /// <param name="renderer">The HTML renderer.</param>
+    /// <param name="kind">The kind of the alert to render</param>
+    public static void DefaultRenderKind(HtmlRenderer renderer, StringSlice kind)
+    {
+        if (kind.Length >= 16)
+        {
+            return;
+        }
+
+        Span<char> upperKind = stackalloc char[kind.Length];
+        kind.AsSpan().ToUpperInvariant(upperKind);
+        string? html = upperKind switch
+        {
+            "NOTE" => "<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M0 8a8 8 0 1 1 16 0A8 8 0 0 1 0 8Zm8-6.5a6.5 6.5 0 1 0 0 13 6.5 6.5 0 0 0 0-13ZM6.5 7.75A.75.75 0 0 1 7.25 7h1a.75.75 0 0 1 .75.75v2.75h.25a.75.75 0 0 1 0 1.5h-2a.75.75 0 0 1 0-1.5h.25v-2h-.25a.75.75 0 0 1-.75-.75ZM8 6a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"></path></svg>Note</p>",
+            "TIP" => "<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M8 1.5c-2.363 0-4 1.69-4 3.75 0 .984.424 1.625.984 2.304l.214.253c.223.264.47.556.673.848.284.411.537.896.621 1.49a.75.75 0 0 1-1.484.211c-.04-.282-.163-.547-.37-.847a8.456 8.456 0 0 0-.542-.68c-.084-.1-.173-.205-.268-.32C3.201 7.75 2.5 6.766 2.5 5.25 2.5 2.31 4.863 0 8 0s5.5 2.31 5.5 5.25c0 1.516-.701 2.5-1.328 3.259-.095.115-.184.22-.268.319-.207.245-.383.453-.541.681-.208.3-.33.565-.37.847a.751.751 0 0 1-1.485-.212c.084-.593.337-1.078.621-1.489.203-.292.45-.584.673-.848.075-.088.147-.173.213-.253.561-.679.985-1.32.985-2.304 0-2.06-1.637-3.75-4-3.75ZM5.75 12h4.5a.75.75 0 0 1 0 1.5h-4.5a.75.75 0 0 1 0-1.5ZM6 15.25a.75.75 0 0 1 .75-.75h2.5a.75.75 0 0 1 0 1.5h-2.5a.75.75 0 0 1-.75-.75Z\"></path></svg>Tip</p>",
+            "IMPORTANT" => "<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M0 1.75C0 .784.784 0 1.75 0h12.5C15.216 0 16 .784 16 1.75v9.5A1.75 1.75 0 0 1 14.25 13H8.06l-2.573 2.573A1.458 1.458 0 0 1 3 14.543V13H1.75A1.75 1.75 0 0 1 0 11.25Zm1.75-.25a.25.25 0 0 0-.25.25v9.5c0 .138.112.25.25.25h2a.75.75 0 0 1 .75.75v2.19l2.72-2.72a.749.749 0 0 1 .53-.22h6.5a.25.25 0 0 0 .25-.25v-9.5a.25.25 0 0 0-.25-.25Zm7 2.25v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 9a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"></path></svg>Important</p>",
+            "WARNING" => "<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M6.457 1.047c.659-1.234 2.427-1.234 3.086 0l6.082 11.378A1.75 1.75 0 0 1 14.082 15H1.918a1.75 1.75 0 0 1-1.543-2.575Zm1.763.707a.25.25 0 0 0-.44 0L1.698 13.132a.25.25 0 0 0 .22.368h12.164a.25.25 0 0 0 .22-.368Zm.53 3.996v2.5a.75.75 0 0 1-1.5 0v-2.5a.75.75 0 0 1 1.5 0ZM9 11a1 1 0 1 1-2 0 1 1 0 0 1 2 0Z\"></path></svg>Warning</p>",
+            "CAUTION" => "<p class=\"markdown-alert-title\"><svg viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"><path d=\"M4.47.22A.749.749 0 0 1 5 0h6c.199 0 .389.079.53.22l4.25 4.25c.141.14.22.331.22.53v6a.749.749 0 0 1-.22.53l-4.25 4.25A.749.749 0 0 1 11 16H5a.749.749 0 0 1-.53-.22L.22 11.53A.749.749 0 0 1 0 11V5c0-.199.079-.389.22-.53Zm.84 1.28L1.5 5.31v5.38l3.81 3.81h5.38l3.81-3.81V5.31L10.69 1.5ZM8 4a.75.75 0 0 1 .75.75v3.5a.75.75 0 0 1-1.5 0v-3.5A.75.75 0 0 1 8 4Zm0 8a1 1 0 1 1 0-2 1 1 0 0 1 0 2Z\"></path></svg>Caution</p>",
+            _ => null
+        };
+
+        if (html is not null)
+        {
+            renderer.WriteLine(html);
+        }
+    }
+}

src/Markdig/Extensions/Alerts/AlertExtension.cs

@@ -0,0 +1,44 @@
+// Copyright (c) Alexandre Mutel. All rights reserved.
+// This file is licensed under the BSD-Clause 2 license.
+// See the license.txt file in the project root for more information.
+
+using Markdig.Helpers;
+using Markdig.Parsers.Inlines;
+using Markdig.Renderers;
+using Markdig.Renderers.Html;
+
+namespace Markdig.Extensions.Alerts;
+
+/// <summary>
+/// Extension for adding alerts to a Markdown pipeline.
+/// </summary>
+public class AlertExtension : IMarkdownExtension
+{
+    /// <summary>
+    /// Gets or sets the delegate to render the kind of the alert.
+    /// </summary>
+    public Action<HtmlRenderer, StringSlice>? RenderKind { get; set; }
+
+    /// <inheritdoc />
+    public void Setup(MarkdownPipelineBuilder pipeline)
+    {
+        var inlineParser = pipeline.InlineParsers.Find<AlertInlineParser>();
+        if (inlineParser == null)
+        {
+            pipeline.InlineParsers.InsertBefore<LinkInlineParser>(new AlertInlineParser());
+        }
+    }
+
+    /// <inheritdoc />
+    public void Setup(MarkdownPipeline pipeline, IMarkdownRenderer renderer)
+    {
+        var blockRenderer = renderer.ObjectRenderers.FindExact<AlertBlockRenderer>();
+        if (blockRenderer == null)
+        {
+            renderer.ObjectRenderers.InsertBefore<QuoteBlockRenderer>(new AlertBlockRenderer()
+            {
+                RenderKind = RenderKind ?? AlertBlockRenderer.DefaultRenderKind
+            });
+        }
+    }
+}

src/Markdig/Extensions/Alerts/AlertInlineParser.cs

@@ -0,0 +1,134 @@
+// Copyright (c) Alexandre Mutel. All rights reserved.
+// This file is licensed under the BSD-Clause 2 license.
+// See the license.txt file in the project root for more information.
+
+using Markdig.Helpers;
+using Markdig.Parsers;
+using Markdig.Renderers.Html;
+using Markdig.Syntax;
+
+namespace Markdig.Extensions.Alerts;
+
+/// <summary>
+/// An inline parser for an alert inline (e.g. `[!NOTE]`).
+/// </summary>
+/// <seealso cref="InlineParser" />
+public class AlertInlineParser : InlineParser
+{
+    private static readonly TransformedStringCache s_alertTypeClassCache = new(
+        type => $"markdown-alert-{type.ToLowerInvariant()}");
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="AlertInlineParser"/> class.
+    /// </summary>
+    public AlertInlineParser()
+    {
+        OpeningCharacters = ['['];
+    }
+
+    public override bool Match(InlineProcessor processor, ref StringSlice slice)
+    {
+        if (slice.PeekChar() != '!')
+        {
+            return false;
+        }
+
+        // We expect the alert to be the first child of a quote block. Example:
+        // > [!NOTE]
+        // > This is a note
+        if (processor.Block is not ParagraphBlock paragraphBlock ||
+            paragraphBlock.Parent is not QuoteBlock quoteBlock ||
+            paragraphBlock.Inline?.FirstChild != null ||
+            quoteBlock is AlertBlock ||
+            quoteBlock.Parent is not MarkdownDocument)
+        {
+            return false;
+        }
+
+        StringSlice saved = slice;
+
+        slice.SkipChar(); // Skip [
+        char c = slice.NextChar(); // Skip !
+
+        int start = slice.Start;
+        int end = start;
+        while (c.IsAlpha())
+        {
+            end = slice.Start;
+            c = slice.NextChar();
+        }
+
+        // We need at least one character
+        if (c != ']' || start == end)
+        {
+            slice = saved;
+            return false;
+        }
+
+        var alertType = new StringSlice(slice.Text, start, end);
+        c = slice.NextChar(); // Skip ]
+
+        start = slice.Start;
+        while (true)
+        {
+            if (c == '\0' || c == '\n' || c == '\r')
+            {
+                end = slice.Start;
+                if (c == '\r')
+                {
+                    c = slice.NextChar(); // Skip \r
+                    if (c == '\0' || c == '\n')
+                    {
+                        end = slice.Start;
+                        if (c == '\n')
+                        {
+                            slice.SkipChar(); // Skip \n
+                        }
+                    }
+                }
+                else if (c == '\n')
+                {
+                    slice.SkipChar(); // Skip \n
+                }
+                break;
+            }
+            else if (!c.IsSpaceOrTab())
+            {
+                slice = saved;
+                return false;
+            }
+
+            c = slice.NextChar();
+        }
+
+        var alertBlock = new AlertBlock(alertType)
+        {
+            Span = quoteBlock.Span,
+            TriviaSpaceAfterKind = new StringSlice(slice.Text, start, end),
+            Line = quoteBlock.Line,
+            Column = quoteBlock.Column,
+        };
+
+        HtmlAttributes attributes = alertBlock.GetAttributes();
+        attributes.AddClass("markdown-alert");
+        attributes.AddClass(s_alertTypeClassCache.Get(alertType.AsSpan()));
+
+        // Replace the quote block with the alert block
+        var parentQuoteBlock = quoteBlock.Parent!;
+        var indexOfQuoteBlock = parentQuoteBlock.IndexOf(quoteBlock);
+        parentQuoteBlock[indexOfQuoteBlock] = alertBlock;
+
+        while (quoteBlock.Count > 0)
+        {
+            var block = quoteBlock[0];
+            quoteBlock.RemoveAt(0);
+            alertBlock.Add(block);
+        }
+
+        // Workaround to replace the parent container
+        // Experimental API, so we are keeping it internal for now until we are sure it's the way we want to go
+        processor.ReplaceParentContainer(quoteBlock, alertBlock);
+
+        return true;
+    }
+}

src/Markdig/Extensions/AutoIdentifiers/AutoIdentifierExtension.cs

@@ -2,8 +2,6 @@
 // This file is licensed under the BSD-Clause 2 license.
 // See the license.txt file in the project root for more information.
 
-using System.Collections.Generic;
-using System.IO;
 using Markdig.Helpers;
 using Markdig.Parsers;
 using Markdig.Renderers;
@@ -11,206 +9,214 @@ using Markdig.Renderers.Html;
 using Markdig.Syntax;
 using Markdig.Syntax.Inlines;
 
-namespace Markdig.Extensions.AutoIdentifiers
+namespace Markdig.Extensions.AutoIdentifiers;
+
+/// <summary>
+/// The auto-identifier extension
+/// </summary>
+/// <seealso cref="IMarkdownExtension" />
+public class AutoIdentifierExtension : IMarkdownExtension
 {
+    private const string AutoIdentifierKey = "AutoIdentifier";
+
+    private static readonly StripRendererCache _rendererCache = new();
+
+    private readonly AutoIdentifierOptions _options;
+    private readonly ProcessInlineDelegate _processInlinesBegin;
+    private readonly ProcessInlineDelegate _processInlinesEnd;
+
     /// <summary>
-    /// The auto-identifier extension
+    /// Initializes a new instance of the <see cref="AutoIdentifierExtension"/> class.
     /// </summary>
-    /// <seealso cref="IMarkdownExtension" />
-    public class AutoIdentifierExtension : IMarkdownExtension
+    /// <param name="options">The options.</param>
+    public AutoIdentifierExtension(AutoIdentifierOptions options)
     {
-        private const string AutoIdentifierKey = "AutoIdentifier";
-        private readonly AutoIdentifierOptions options;
-        private readonly StripRendererCache rendererCache = new StripRendererCache();
+        _options = options;
+        _processInlinesBegin = DocumentOnProcessInlinesBegin;
+        _processInlinesEnd = HeadingBlock_ProcessInlinesEnd;
+    }
 
-        /// <summary>
-        /// Initializes a new instance of the <see cref="AutoIdentifierExtension"/> class.
-        /// </summary>
-        /// <param name="options">The options.</param>
-        public AutoIdentifierExtension(AutoIdentifierOptions options)
+    public void Setup(MarkdownPipelineBuilder pipeline)
+    {
+        var headingBlockParser = pipeline.BlockParsers.Find<HeadingBlockParser>();
+        if (headingBlockParser != null)
         {
-            this.options = options;
+            // Install a hook on the HeadingBlockParser when a HeadingBlock is actually processed
+            headingBlockParser.Closed -= HeadingBlockParser_Closed;
+            headingBlockParser.Closed += HeadingBlockParser_Closed;
+        }
+        var paragraphBlockParser = pipeline.BlockParsers.FindExact<ParagraphBlockParser>();
+        if (paragraphBlockParser != null)
+        {
+            // Install a hook on the ParagraphBlockParser when a HeadingBlock is actually processed as a Setex heading
+            paragraphBlockParser.Closed -= HeadingBlockParser_Closed;
+            paragraphBlockParser.Closed += HeadingBlockParser_Closed;
+        }
+    }
+
+    public void Setup(MarkdownPipeline pipeline, IMarkdownRenderer renderer)
+    {
+    }
+
+    /// <summary>
+    /// Process on a new <see cref="HeadingBlock"/>
+    /// </summary>
+    /// <param name="processor">The processor.</param>
+    /// <param name="block">The heading block.</param>
+    private void HeadingBlockParser_Closed(BlockProcessor processor, Block block)
+    {
+        // We may have a ParagraphBlock here as we have a hook on the ParagraphBlockParser
+        if (!(block is HeadingBlock headingBlock))
+        {
+            return;
         }
 
-        public void Setup(MarkdownPipelineBuilder pipeline)
+        // If the AutoLink options is set, we register a LinkReferenceDefinition at the document level
+        if ((_options & AutoIdentifierOptions.AutoLink) != 0)
         {
-            var headingBlockParser = pipeline.BlockParsers.Find<HeadingBlockParser>();
-            if (headingBlockParser != null)
+            var headingLine = headingBlock.Lines.Lines[0];
+
+            var text = headingLine.ToString();
+
+            var linkRef = new HeadingLinkReferenceDefinition(headingBlock)
             {
-                // Install a hook on the HeadingBlockParser when a HeadingBlock is actually processed
-                headingBlockParser.Closed -= HeadingBlockParser_Closed;
-                headingBlockParser.Closed += HeadingBlockParser_Closed;
-            }
-            var paragraphBlockParser = pipeline.BlockParsers.FindExact<ParagraphBlockParser>();
-            if (paragraphBlockParser != null)
-            {
-                // Install a hook on the ParagraphBlockParser when a HeadingBlock is actually processed as a Setex heading
-                paragraphBlockParser.Closed -= HeadingBlockParser_Closed;
-                paragraphBlockParser.Closed += HeadingBlockParser_Closed;
-            }
-        }
-
-        public void Setup(MarkdownPipeline pipeline, IMarkdownRenderer renderer)
-        {
-        }
-
-        /// <summary>
-        /// Process on a new <see cref="HeadingBlock"/>
-        /// </summary>
-        /// <param name="processor">The processor.</param>
-        /// <param name="block">The heading block.</param>
-        private void HeadingBlockParser_Closed(BlockProcessor processor, Block block)
-        {
-            // We may have a ParagraphBlock here as we have a hook on the ParagraphBlockParser
-            if (!(block is HeadingBlock headingBlock))
-            {
-                return;
-            }
-
-            // If the AutoLink options is set, we register a LinkReferenceDefinition at the document level
-            if ((options & AutoIdentifierOptions.AutoLink) != 0)
-            {
-                var headingLine = headingBlock.Lines.Lines[0];
-
-                var text = headingLine.ToString();
-
-                var linkRef = new HeadingLinkReferenceDefinition(headingBlock)
-                {
-                    CreateLinkInline = CreateLinkInlineForHeading
-                };
-
-                var doc = processor.Document;
-                var dictionary = doc.GetData(this) as Dictionary<string, HeadingLinkReferenceDefinition>;
-                if (dictionary is null)
-                {
-                    dictionary = new Dictionary<string, HeadingLinkReferenceDefinition>();
-                    doc.SetData(this, dictionary);
-                    doc.ProcessInlinesBegin += DocumentOnProcessInlinesBegin;
-                }
-                dictionary[text] = linkRef;
-            }
-
-            // Then we register after inline have been processed to actually generate the proper #id
-            headingBlock.ProcessInlinesEnd += HeadingBlock_ProcessInlinesEnd;
-        }
-
-        private void DocumentOnProcessInlinesBegin(InlineProcessor processor, Inline? inline)
-        {
-            var doc = processor.Document;
-            doc.ProcessInlinesBegin -= DocumentOnProcessInlinesBegin;
-            var dictionary = (Dictionary<string, HeadingLinkReferenceDefinition>)doc.GetData(this)!;
-            foreach (var keyPair in dictionary)
-            {
-                // Here we make sure that auto-identifiers will not override an existing link definition
-                // defined in the document
-                // If it is the case, we skip the auto identifier for the Heading
-                if (!doc.TryGetLinkReferenceDefinition(keyPair.Key, out var linkDef))
-                {
-                    doc.SetLinkReferenceDefinition(keyPair.Key, keyPair.Value, true);
-                }
-            }
-            // Once we are done, we don't need to keep the intermediate dictionary around
-            doc.RemoveData(this);
-        }
-
-        /// <summary>
-        /// Callback when there is a reference to found to a heading.
-        /// Note that reference are only working if they are declared after.
-        /// </summary>
-        private Inline CreateLinkInlineForHeading(InlineProcessor inlineState, LinkReferenceDefinition linkRef, Inline? child)
-        {
-            var headingRef = (HeadingLinkReferenceDefinition) linkRef;
-            return new LinkInline()
-            {
-                // Use GetDynamicUrl to allow late binding of the Url (as a link may occur before the heading is declared and
-                // the inlines of the heading are actually processed by HeadingBlock_ProcessInlinesEnd)
-                GetDynamicUrl = () => HtmlHelper.Unescape("#" + headingRef.Heading.GetAttributes().Id),
-                Title = HtmlHelper.Unescape(linkRef.Title),
+                CreateLinkInline = CreateLinkInlineForHeading
             };
+
+            var doc = processor.Document;
+            var dictionary = doc.GetData(this) as Dictionary<string, HeadingLinkReferenceDefinition>;
+            if (dictionary is null)
+            {
+                dictionary = new Dictionary<string, HeadingLinkReferenceDefinition>();
+                doc.SetData(this, dictionary);
+                doc.ProcessInlinesBegin += _processInlinesBegin;
+            }
+            dictionary[text] = linkRef;
         }
 
-        /// <summary>
-        /// Process the inlines of the heading to create a unique identifier
-        /// </summary>
-        /// <param name="processor">The processor.</param>
-        /// <param name="inline">The inline.</param>
-        private void HeadingBlock_ProcessInlinesEnd(InlineProcessor processor, Inline? inline)
+        // Then we register after inline have been processed to actually generate the proper #id
+        headingBlock.ProcessInlinesEnd += _processInlinesEnd;
+    }
+
+    private void DocumentOnProcessInlinesBegin(InlineProcessor processor, Inline? inline)
+    {
+        var doc = processor.Document;
+        doc.ProcessInlinesBegin -= _processInlinesBegin;
+        var dictionary = (Dictionary<string, HeadingLinkReferenceDefinition>)doc.GetData(this)!;
+        foreach (var keyPair in dictionary)
         {
-            var identifiers = processor.Document.GetData(AutoIdentifierKey) as HashSet<string>;
-            if (identifiers is null)
+            // Here we make sure that auto-identifiers will not override an existing link definition
+            // defined in the document
+            // If it is the case, we skip the auto identifier for the Heading
+            if (!doc.TryGetLinkReferenceDefinition(keyPair.Key, out var linkDef))
             {
-                identifiers = new HashSet<string>();
-                processor.Document.SetData(AutoIdentifierKey, identifiers);
+                doc.SetLinkReferenceDefinition(keyPair.Key, keyPair.Value, true);
             }
+        }
+        // Once we are done, we don't need to keep the intermediate dictionary around
+        doc.RemoveData(this);
+    }
 
-            var headingBlock = (HeadingBlock) processor.Block!;
-            if (headingBlock.Inline is null)
-            {
-                return;
-            }
+    /// <summary>
+    /// Callback when there is a reference to found to a heading.
+    /// Note that reference are only working if they are declared after.
+    /// </summary>
+    private static Inline CreateLinkInlineForHeading(InlineProcessor inlineState, LinkReferenceDefinition linkRef, Inline? child)
+    {
+        var headingRef = (HeadingLinkReferenceDefinition) linkRef;
+        return new LinkInline()
+        {
+            // Use GetDynamicUrl to allow late binding of the Url (as a link may occur before the heading is declared and
+            // the inlines of the heading are actually processed by HeadingBlock_ProcessInlinesEnd)
+            GetDynamicUrl = () => HtmlHelper.Unescape("#" + headingRef.Heading.GetAttributes().Id),
+            Title = HtmlHelper.Unescape(linkRef.Title),
+        };
+    }
 
-            // If id is already set, don't try to modify it
-            var attributes = processor.Block!.GetAttributes();
-            if (attributes.Id != null)
-            {
-                return;
-            }
-
-            // Use internally a HtmlRenderer to strip links from a heading
-            var stripRenderer = rendererCache.Get();
-
-            stripRenderer.Render(headingBlock.Inline);
-            var headingText = stripRenderer.Writer.ToString()!;
-            rendererCache.Release(stripRenderer);
-
-            // Urilize the link
-            headingText = (options & AutoIdentifierOptions.GitHub) != 0
-                ? LinkHelper.UrilizeAsGfm(headingText)
-                : LinkHelper.Urilize(headingText, (options & AutoIdentifierOptions.AllowOnlyAscii) != 0);
-
-            // If the heading is empty, use the word "section" instead
-            var baseHeadingId = string.IsNullOrEmpty(headingText) ? "section" : headingText;
-
-            // Add a trailing -1, -2, -3...etc. in case of collision
-            var headingId = baseHeadingId;
-            if (!identifiers.Add(headingId))
-            {
-                var headingBuffer = new ValueStringBuilder(stackalloc char[ValueStringBuilder.StackallocThreshold]);
-                headingBuffer.Append(baseHeadingId);
-                headingBuffer.Append('-');
-                uint index = 0;
-                do
-                {
-                    index++;
-                    headingBuffer.Append(index);
-                    headingId = headingBuffer.AsSpan().ToString();
-                    headingBuffer.Length = baseHeadingId.Length + 1;
-                }
-                while (!identifiers.Add(headingId));
-                headingBuffer.Dispose();
-            }
-
-            attributes.Id = headingId;
+    /// <summary>
+    /// Process the inlines of the heading to create a unique identifier
+    /// </summary>
+    /// <param name="processor">The processor.</param>
+    /// <param name="inline">The inline.</param>
+    private void HeadingBlock_ProcessInlinesEnd(InlineProcessor processor, Inline? inline)
+    {
+        var identifiers = processor.Document.GetData(AutoIdentifierKey) as HashSet<string>;
+        if (identifiers is null)
+        {
+            identifiers = new HashSet<string>();
+            processor.Document.SetData(AutoIdentifierKey, identifiers);
         }
 
-        private sealed class StripRendererCache : ObjectCache<HtmlRenderer>
+        var headingBlock = (HeadingBlock) processor.Block!;
+        if (headingBlock.Inline is null)
         {
-            protected override HtmlRenderer NewInstance()
-            {
-                var headingWriter = new StringWriter();
-                var stripRenderer = new HtmlRenderer(headingWriter)
-                {
-                    // Set to false both to avoid having any HTML tags in the output
-                    EnableHtmlForInline = false,
-                    EnableHtmlEscape = false
-                };
-                return stripRenderer;
-            }
+            return;
+        }
 
-            protected override void Reset(HtmlRenderer instance)
+        // If id is already set, don't try to modify it
+        var attributes = processor.Block!.GetAttributes();
+        if (attributes.Id != null)
+        {
+            return;
+        }
+
+        // Use internally a HtmlRenderer to strip links from a heading
+        var stripRenderer = _rendererCache.Get();
+
+        stripRenderer.Render(headingBlock.Inline);
+        ReadOnlySpan<char> rawHeadingText = ((FastStringWriter)stripRenderer.Writer).AsSpan();
+
+        // Urilize the link
+        string headingText = (_options & AutoIdentifierOptions.GitHub) != 0
+            ? LinkHelper.UrilizeAsGfm(rawHeadingText)
+            : LinkHelper.Urilize(rawHeadingText, (_options & AutoIdentifierOptions.AllowOnlyAscii) != 0);
+
+        _rendererCache.Release(stripRenderer);
+
+        // If the heading is empty, use the word "section" instead
+        var baseHeadingId = string.IsNullOrEmpty(headingText) ? "section" : headingText;
+
+        // Add a trailing -1, -2, -3...etc. in case of collision
+        var headingId = baseHeadingId;
+        if (!identifiers.Add(headingId))
+        {
+            var headingBuffer = new ValueStringBuilder(stackalloc char[ValueStringBuilder.StackallocThreshold]);
+            headingBuffer.Append(baseHeadingId);
+            headingBuffer.Append('-');
+            uint index = 0;
+            do
             {
-                instance.Reset();
+                index++;
+                headingBuffer.Append(index);
+                headingId = headingBuffer.AsSpan().ToString();
+                headingBuffer.Length = baseHeadingId.Length + 1;
             }
+            while (!identifiers.Add(headingId));
+            headingBuffer.Dispose();
+        }
+
+        attributes.Id = headingId;
+    }
+
+    private sealed class StripRendererCache : ObjectCache<HtmlRenderer>
+    {
+        protected override HtmlRenderer NewInstance()
+        {
+            var headingWriter = new FastStringWriter();
+            var stripRenderer = new HtmlRenderer(headingWriter)
+            {
+                // Set to false both to avoid having any HTML tags in the output
+                EnableHtmlForInline = false,
+                EnableHtmlEscape = false
+            };
+            return stripRenderer;
+        }
+
+        protected override void Reset(HtmlRenderer instance)
+        {
+            instance.ResetInternal();
+
+            ((FastStringWriter)instance.Writer).Reset();
         }
     }
 }

src/Markdig/Extensions/AutoIdentifiers/AutoIdentifierOptions.cs

@@ -2,39 +2,36 @@
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
 
-using System;
+namespace Markdig.Extensions.AutoIdentifiers;
 
-namespace Markdig.Extensions.AutoIdentifiers
+/// <summary>
+/// Options for the <see cref="AutoIdentifierExtension"/>.
+/// </summary>
+[Flags]
+public enum AutoIdentifierOptions
 {
     /// <summary>
-    /// Options for the <see cref="AutoIdentifierExtension"/>.
+    /// No options: does not apply any additional formatting and/or transformations.  
     /// </summary>
-    [Flags]
-    public enum AutoIdentifierOptions
-    {
-        /// <summary>
-        /// No options: does not apply any additional formatting and/or transformations.  
-        /// </summary>
-        None = 0,
+    None = 0,
 
-        /// <summary>
-        /// Default (<see cref="AutoLink"/>)
-        /// </summary>
-        Default = AutoLink | AllowOnlyAscii,
+    /// <summary>
+    /// Default (<see cref="AutoLink"/>)
+    /// </summary>
+    Default = AutoLink | AllowOnlyAscii,
 
-        /// <summary>
-        /// Allows to link to a header by using the same text as the header for the link label. Default is <c>true</c>
-        /// </summary>
-        AutoLink = 1,
+    /// <summary>
+    /// Allows to link to a header by using the same text as the header for the link label. Default is <c>true</c>
+    /// </summary>
+    AutoLink = 1,
 
-        /// <summary>
-        /// Allows only ASCII characters in the url (HTML 5 allows to have UTF8 characters). Default is <c>true</c>
-        /// </summary>
-        AllowOnlyAscii = 2,
+    /// <summary>
+    /// Allows only ASCII characters in the url (HTML 5 allows to have UTF8 characters). Default is <c>true</c>
+    /// </summary>
+    AllowOnlyAscii = 2,
 
-        /// <summary>
-        /// Renders auto identifiers like GitHub.
-        /// </summary>
-        GitHub = 4,
-    }
+    /// <summary>
+    /// Renders auto identifiers like GitHub.
+    /// </summary>
+    GitHub = 4,
 }

src/Markdig/Extensions/AutoIdentifiers/HeadingLinkReferenceDefinition.cs

@@ -4,22 +4,21 @@
 
 using Markdig.Syntax;
 
-namespace Markdig.Extensions.AutoIdentifiers
-{
-    /// <summary>
-    /// A link reference definition to a <see cref="HeadingBlock"/> stored at the <see cref="MarkdownDocument"/> level.
-    /// </summary>
-    /// <seealso cref="LinkReferenceDefinition" />
-    public class HeadingLinkReferenceDefinition : LinkReferenceDefinition
-    {
-        public HeadingLinkReferenceDefinition(HeadingBlock headling)
-        {
-            Heading = headling;
-        }
+namespace Markdig.Extensions.AutoIdentifiers;
 
-        /// <summary>
-        /// Gets or sets the heading related to this link reference definition.
-        /// </summary>
-        public HeadingBlock Heading { get; set; }
+/// <summary>
+/// A link reference definition to a <see cref="HeadingBlock"/> stored at the <see cref="MarkdownDocument"/> level.
+/// </summary>
+/// <seealso cref="LinkReferenceDefinition" />
+public class HeadingLinkReferenceDefinition : LinkReferenceDefinition
+{
+    public HeadingLinkReferenceDefinition(HeadingBlock headling)
+    {
+        Heading = headling;
     }
+
+    /// <summary>
+    /// Gets or sets the heading related to this link reference definition.
+    /// </summary>
+    public HeadingBlock Heading { get; set; }
 }

src/Markdig/Extensions/AutoLinks/AutoLinkExtension.cs

@@ -5,32 +5,26 @@
 using Markdig.Renderers;
 using Markdig.Syntax.Inlines;
 
-namespace Markdig.Extensions.AutoLinks
+namespace Markdig.Extensions.AutoLinks;
+
+/// <summary>
+/// Extension to automatically create <see cref="LinkInline"/> when a link url http: or mailto: is found.
+/// </summary>
+/// <seealso cref="IMarkdownExtension" />
+public class AutoLinkExtension(AutoLinkOptions? options) : IMarkdownExtension
 {
-    /// <summary>
-    /// Extension to automatically create <see cref="LinkInline"/> when a link url http: or mailto: is found.
-    /// </summary>
-    /// <seealso cref="IMarkdownExtension" />
-    public class AutoLinkExtension : IMarkdownExtension
+    public readonly AutoLinkOptions Options = options ?? new AutoLinkOptions();
+
+    public void Setup(MarkdownPipelineBuilder pipeline)
     {
-        public readonly AutoLinkOptions Options;
-
-        public AutoLinkExtension(AutoLinkOptions? options)
-        {
-            Options = options ?? new AutoLinkOptions();
-        }
-
-        public void Setup(MarkdownPipelineBuilder pipeline)
-        {
-            if (!pipeline.InlineParsers.Contains<AutoLinkParser>())
-            {
-                // Insert the parser before any other parsers
-                pipeline.InlineParsers.Insert(0, new AutoLinkParser(Options));
-            }
-        }
-
-        public void Setup(MarkdownPipeline pipeline, IMarkdownRenderer renderer)
+        if (!pipeline.InlineParsers.Contains<AutoLinkParser>())
         {
+            // Insert the parser before any other parsers
+            pipeline.InlineParsers.Insert(0, new AutoLinkParser(Options));
         }
     }
+
+    public void Setup(MarkdownPipeline pipeline, IMarkdownRenderer renderer)
+    {
+    }
 }

src/Markdig/Extensions/AutoLinks/AutoLinkOptions.cs

@@ -2,25 +2,29 @@
 // This file is licensed under the BSD-Clause 2 license. 
 // See the license.txt file in the project root for more information.
 
-namespace Markdig.Extensions.AutoLinks
+namespace Markdig.Extensions.AutoLinks;
+
+public class AutoLinkOptions
 {
-    public class AutoLinkOptions
+    public AutoLinkOptions()
     {
-        public AutoLinkOptions()
-        {
-            ValidPreviousCharacters = "*_~(";
-        }
-
-        public string ValidPreviousCharacters { get; set; }
-
-        /// <summary>
-        /// Should the link open in a new window when clicked (false by default)
-        /// </summary>
-        public bool OpenInNewWindow { get; set; }
-
-        /// <summary>
-        /// Should a www link be prefixed with https:// instead of http:// (false by default)
-        /// </summary>
-        public bool UseHttpsForWWWLinks { get; set; }
+        ValidPreviousCharacters = "*_~(";
     }
+
+    public string ValidPreviousCharacters { get; set; }
+
+    /// <summary>
+    /// Should the link open in a new window when clicked (false by default)
+    /// </summary>
+    public bool OpenInNewWindow { get; set; }
+
+    /// <summary>
+    /// Should a www link be prefixed with https:// instead of http:// (false by default)
+    /// </summary>
+    public bool UseHttpsForWWWLinks { get; set; }
+
+    /// <summary>
+    /// Should auto-linking allow a domain with no period, e.g. https://localhost (false by default)
+    /// </summary>
+    public bool AllowDomainWithoutPeriod { get; set; }
 }