XHTML
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
page revision: 3, last edited: 14 Jul 2011 12:50