The Extensible HyperText Markup Language, or XHTML, is a
markup language that has the same depth of expression as
HTML, but also conforms to
XML syntax.Whereas HTML is an application of
Standard Generalized Markup Language (SGML), a very flexible markup language, XHTML is an application of
XML, a more restrictive subset of SGML. Because they need to be well-formed, true XHTML documents allow for automated processing to be performed using standard XML tools—unlike HTML, which requires a relatively complex, lenient, and generally custom
parser. XHTML can be thought of as the intersection of HTML and XML in many respects, since it is a reformulation of HTML in XML. XHTML 1.0 became a
World Wide Web Consortium (W3C) Recommendation on
January 26,
2000. XHTML 1.1 became a W3C recommendation on
May 31,
2001.
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<
hypertext,
standard,
World-Wide Web> A reformulation of
HTML 4.01 in
XML. Being XML means that XHTML can be viewed, edited, and validated with standard XML tools. At the same time, it operates as well as or better than HTML 4 in existing HTML 4 conforming user agents.
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Latest version: 1.0, as of 2000-09-10.
(2000-09-10)
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