Markup language which places HTML in XML form / From Wikipedia, the free encyclopedia

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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.

Quick facts: Filename extension, Internet media type,...
Filename extension
.xhtml, .xht,
.xml, .html, .htm
Internet media type
Uniform Type Identifier (UTI)public.XHTML
UTI conformationpublic.xml
Developed byWorld Wide Web Consortium (W3C)
Initial release26 January 2000 (2000-01-26)
Latest release
28 October 2014; 8 years ago (2014-10-28)
Type of formatMarkup language
Extended fromXML, HTML
StandardW3C HTML5 (Recommendation)
Open format?Yes

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.[1]

XHTML 1.0 became a World Wide Web Consortium (W3C) recommendation on 26 January 2000. XHTML 1.1 became a W3C recommendation on 31 May 2001. The standard known as XHTML5 is being developed as an XML adaptation of the HTML5 specification.[2][3]