XHTML
XHTML.png

eXtensible HyperText Markup Language
extends Hypertext Markup Language (HTML)

Differences

HTML (pre-HTML5)
Standard Generalized Markup Language (SGML)

XHTML
XML (restrictive subset of SGML)
well-formed documents
standard XML parsers

Development

XHTML 1.0
World Wide Web Consortium (W3C) Recommendation
January 26, 2000

XHTML 1.1
W3C Recommendation
May 31, 2001

XHTML5
HTML5 specification

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