# Extensions

The following additional emphasis are supported:

## Strikethrough
 
Allows to strikethrough a span of text by surrounding it by `~~`. The semantic used for the generated HTML is the tag `<del>`.

```````````````````````````````` example
The following text ~~is deleted~~
.
<p>The following text <del>is deleted</del></p>
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## Superscript and Subscript
 
Superscripts can be written by surrounding a text by ^ characters; subscripts can be written by surrounding the subscripted text by ~ characters

```````````````````````````````` example
H~2~O is a liquid. 2^10^ is 1024
.
<p>H<sub>2</sub>O is a liquid. 2<sup>10</sup> is 1024</p>
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Certain punctuation characters are exempted from the rule forbidding them within inline delimiters

```````````````````````````````` example
One quintillionth can be expressed as 10^-18^

Daggers^†^ and double-daggers^‡^ can be used to denote notes.
.
<p>One quintillionth can be expressed as 10<sup>-18</sup></p>
<p>Daggers<sup>†</sup> and double-daggers<sup>‡</sup> can be used to denote notes.</p>
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## Inserted

Inserted text can be used to specify that a text has been added to a document.  The semantic used for the generated HTML is the tag `<ins>`.
 
```````````````````````````````` example
++Inserted text++
.
<p><ins>Inserted text</ins></p>
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## Marked

Marked text can be used to specify that a text has been marked in a document.  The semantic used for the generated HTML is the tag `<mark>`.
 
```````````````````````````````` example
==Marked text==
.
<p><mark>Marked text</mark></p>
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## 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;^
.
<p>This is text MyBrand <sup>®</sup> and MyTrademark <sup>TM</sup>
This is text MyBrand^®^ and MyTrademark^TM^
This is text MyBrand <sub>®</sub> and MyCopyright <sup>©</sup></p>
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