The Extensible HyperText Markup Language, or XHTML, is a markup language that has the same expressive possibilities as HTML, but a stricter syntax. Whereas HTML is an application of 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 (syntactically correct), XHTML documents allow for automated processing to be performed using a standard XML library—unlike HTML, which requires a relatively complex, lenient, and generally custom parser (though an SGML parser library could possibly be used). 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 is the successor to HTML. As such, many consider XHTML to be the “current version” of HTML, but it is a separate, parallel recommendation; the W3C continues to recommend the use of XHTML 1.1, XHTML 1.0, and HTML 4.01 for web publishing.
More on [ XHTML ]
HTML :: Markup Languages
XML :: Markup Languages
CSS :: Style Sheets
Authoring :: Web Design and Development
Designers :: Web Design and Development
Internet :: Programming
MathML :: Metadata

W3C HTML Home Page - The W3C's HTML website, including information about HTML and XHTML.
Meta Description: [ This is W3C's home page for the XHTML2 Working Group. ]
New Architect - Article exploring the issues involved in migrating from HTML to XML.
Meta Description: [ Migrating from HTML to XML (Web Techniques, July 2000) ]
NYPL Styleguide - XHTML 1.0 overview. Includes discussion of accessibility and document validation. Also XHTML authoring tips and tools featuring the use of Dreamweaver.
Meta Description: [ A Style Guide for the Branch Libraries of the New York Public Library. ]
The case for XHTML - A article dispelling myths about the XHTML versus HTML debate.
Meta Description: [ The KuraFire Network is the online home of Faruk Ateş, web standards evangelist at Apple Computer. ]
The HTML Writers Guild - Details the main differences between HTML and XHTML.
Meta Description: [ This page is part of the HTML writers guild Project Gutenberg. The Guild is the world's largest international organization of Web designers. , The HWG Project Gutenberg marks up Gutenberg e-texts as XML and develops DTD's tfor doing this ]
XDG: XHTML Design Guide - Introduction, tutorial, standards documents, and links to articles.
Meta Description: [ XHTML 1.0 is the reformulation of HTML 4 as an application of XML. This Website hopes to provide programming and design guidelines for professional XHTML Developers and Designers ]
XHTML :: How to succeed - Tips and caveats on HTML to XHTML migration for existing browsers.
Meta Description: [ Tips and pitfalls on migrating from HTML to XHTML from the angle of current browsers. ]
XHTML is the Most Important XML Vocabulary - An article covering possible future outcomes for version 2 of the standard.
Meta Description: [ Kendall Grant Clark reviews the latest working draft of XHTML 2.0, finds some welcome changes, and stresses the importance of XHTML as a leading XML vocabulary. ]
XHTML Web Design for Beginners - An introductory article for those with no prior experience of HTML. Covers version 1.0 Transitional.
Meta Description: [ An introduction to designing Web pages using XHTML aimed at beginners. ]
XHTML: Where XML and HTML meet - Discussion of XHTML 1.0 and how it improves on the HTML 4.0 standard. Examines the issues involved in the transition between HTML and XHTML. Also explores backwards compatibility to HTML and XHTML modularization.
Meta Description: [ HTML has now been reformulated in XML. Many new non-PC devices will surf the Web soon, or are already doing it. Make your site available to them by migrating your site to XHTML. ]
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