Finding:

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   HTML

   HTML 4.0 was reissued with minor edits without incrementing the version number. ... The id attribute provides a document-wide unique identifier for an element.
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   XHTML

   By shifting the underlying base from SGML to the simpler XML, HTML would become compatible with common XML tools. ... Modularization provides an abstract collection of components through which XHTML can be subsetted and extended.
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   HTML element

   This element is required in every HTML and XHTML document. ... The required alt attribute provides alternative text in case the image cannot be displayed.
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   Cross-site scripting

   Potentially, such an attack could affect a large number of users with little need for social engineering, and the application could be infected by a cross-site scripting virus or worm. ... Unfortunately, users of many kinds of web applications (commonly forums and webmail) wish to use some of the features HTML provides.
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   Unicode and HTML

   A character reference takes the form &#N;, where N is either a decimal number for the Unicode code point, or a hexadecimal number, in which case it must be prefixed by x. The characters that compose the numeric character reference are universally representable in every encoding approved for use on the Internet. ... For both serializations of HTML (content-type "text/html" and content/type "application/xhtml+xml") using UTF-16 (or UTF-32) also provides an effective way to transmit encoding information within an HTML document.
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   List of XML and HTML character entity references

   The nnnn or hhhh may be any number of digits and may include leading zeros. ... | amp | & | U+0026 (38) | HTML 2.0 | HTMLspecial | ISOnum | ampersand |
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   HTML editor

   Adobe GoLive provides an outline editor to expand and collapse HTML objects and properties, edit parameters, and view graphics attached to the expanded objects. ... However a web page was created or edited, WYSIWYG or by hand, in order to be successful among the greatest possible number of readers and viewers, as well as to maintain the 'worldwide' value of the Web itself it can be argued that, first and foremost, it should consist of valid markup and code.
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   Double spaced sentences

   For example, an increasing number of computer font design guidelines now recommend use of quarter-em spaces rather than third-em spaces. ... HTML provides 4 variations on space width and 1 fixed-width non-breaking space, which are: <space>, &emsp;, &ensp;, and &thinsp; (all breaking); and &nbsp; (non-breaking).
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   French spacing

   For example, an increasing number of computer font design guidelines now recommend use of quarter-em spaces rather than third-em spaces. ... HTML provides 4 variations on space width and 1 fixed-width non-breaking space, which are: <space>, &emsp;, &ensp;, and &thinsp; (all breaking); and &nbsp; (non-breaking).
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    HTML 5

    HTML 5 provides a number of new elements and attributes that reflect typical usage on modern Web sites. ... Here is a cursory list of differences and some specific examples:

Explore the following pages on Powerset:

• HTML,
• XHTML,
• HTML element,
• Cross-site scripting,
• Unicode and HTML,
• List of XML and HTML character entity references,
• HTML editor,
• Double spaced sentences,
• French spacing,
• HTML 5