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HTML Validation Service

Welcome to the W3C HTML Validation Service. It checks HTML documents for conformance to W3C HTML and XHTML Recommendations and other HTML standards. Recent updates include:

• Updated XHTML 1.0, HTML 4.01 DTDs (January 26, 2000)
• Added support for HTML 4.01; updated XHTML 1.0 DTDs (August 24, 1999)
• more...

Enter the address (URI) of a document you would like to validate:

You can also check your Cascading Style Sheets using W3C's CSS Validation Service.

See also

• The HTML authoring newsgroup (for help with HTML)
• How to provide feedback on this service
• Information on the source code availability
• The to-do list for the service
• DTDs (document types) supported by this service (the SGML catalog)
• The www-validator mailing list archives
• W3C's HTML home page
• The W3C HTML 4.01 Recommendation
• The W3C XHTML 1.0 Recommendation

Credits

This service uses:

• James Clark's excellent SGML parser,
• The libwww-perl library by Gisle Aas and Martijn Koster for retrieving documents.
• Patches and ideas from Terje Bless, Liam Quinn, and others.

The first online HTML validation service was created by Dan Connolly and Mark Gaither.

Gerald Oskoboiny
$Date: 2000/03/20 17:47:39 $