Available as: HTML zip archive, XHTML zip archive, XML zip archive, PDF (screen), PDF (paper).

A Note from the W3C detailing the differences and similarities between the two markup languages.

SGML links at the W3C, meant for use in reviews of the HTML specification.

The official W3C page includes a brief definition and links to latest news, players, authoring tools, getting help and the other information.

The W3C's official technical description of the language, including the document type definition and elements within the language.

XML-based language that allows authors to write interactive multimedia presentations, and allows reuse of SMIL syntax and semantics in other XML-based languages, in particular those who need to represent timing and synchronization.

Integrates a subset of the SMIL 2.0 specification with XHTML. Includes SMIL 2.0 modules providing support for animation, content control, media objects, timing and synchronization, and transition effects. (W3C Note 31 January 2002)

The W3C's HTML website, including information about HTML and XHTML.

7 sections: introduction; terminology; module construction; DTD construction; module examples; mark-up language examples; usage examples.

The World Wide Web Consortium's official press release for XHTML 1.0.