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XHTML
Filename extension.xhtml, .xht,
.xml, .html, .htm
Internet media typeapplication/xhtml+xml
Developed byWorld Wide Web Consortium
Initial release26 January 2000
Latest release
5.0
(28 October 2014; 4 years ago)
Type of formatMarkup language
Extended fromXML, HTML
StandardW3C HTML5 (Recommendation)
Open format?Yes

Extensible Hypertext Markup Language (XHTML) is part of the family of XML markup languages. It mirrors or extends versions of the widely used Hypertext Markup Language (HTML), the language in which Web pages are formulated.

While HTML, prior to HTML5, was defined as an application of Standard Generalized Markup Language (SGML), a flexible markup language framework, XHTML is an application of XML, a more restrictive subset of SGML. XHTML documents are well-formed and may therefore be parsed using standard XML parsers, unlike HTML, which requires a lenient HTML-specific parser.

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. The standard known as XHTML5 is being developed as an XML adaptation of the HTML5 specification.

Overview