Finding:

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   Markup language

   Availability of WYSIWYG ("what you see is what you get") publishing software supplanted much use of these languages among casual users, though serious publishing work still uses markup to specify the non-visual structure of texts. ... HTML
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   HTML

   HTML, an initialism of HyperText Markup Language, is the predominant markup language for Web pages. ... XHTML uses XML's built in language-defining functionality attribute.
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   HTML element

   Many HTML elements include attributes in their start tags, defining desired behavior or indicating additional element properties. ... Presentational markup
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   XHTML

   Wikipedia uses XHTML 1.0 Transitional ... This introduced Voyager, the codename for a new markup language based on HTML 4 but adhering to the stricter syntax rules of XML.
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   Standard Generalized Markup Language

   SGML allows most aspects of a markup language's syntax to be customized. ... HTML uses this SGML default syntax.
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   Unicode equivalence

   For instance HTML uses its own markup to position a U+0035 in a superscript position.
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   XML

   Note that this is different from specifying such a stylesheet in HTML, which uses the <link> element. ... ↑ Extensible Markup Language (XML)
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   Comparison of document markup languages

   | HyperText Markup Language (HTML) | Hypertext documents | SGML | Tag | Yes | Yes | ... ↑ uses Content MathML, OpenMath or other formats for formulae
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   Lightweight markup language

   The server software converts the input to a common document markup language like HTML or XHTML. ... | Texy! | **bold text** | *italic text* or //italic text// | `monospace text` | Texy uses by default em (typically italic) and strong (typically bold) tags.
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    List of XML markup languages

    XHTML: a markup language that has the same depth of expression as HTML, but with a syntax conforming to XML ... XML-RPC: a remote procedure call protocol which uses XML to encode its calls and HTTP as a transport mechanism

Explore the following pages on Powerset:

• Markup language,
• HTML,
• HTML element,
• XHTML,
• Standard Generalized Markup Language,
• Unicode equivalence,
• XML,
• Comparison of document markup languages,
• Lightweight markup language,
• List of XML markup languages