Add 'search' HTML tag support

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/Parsers/HtmlBlockParser.cs

@@ -295,7 +295,7 @@ public class HtmlBlockParser : BlockParser
         return BlockState.Continue;
     }
 
-    private static readonly CompactPrefixTree<int> HtmlTags = new(66, 94, 83)
+    private static readonly CompactPrefixTree<int> HtmlTags = new(67, 96, 86)
     {
         { "address", 0 },
         { "article", 1 },
@@ -362,6 +362,7 @@ public class HtmlBlockParser : BlockParser
         { "title", 62 },
         { "tr", 63 },
         { "track", 64 },
-        { "ul", 65 }
+        { "ul", 65 },
+        { "search", 66 },
     };
 }