This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets or to find broken links, there are other validators and tools available.

This is the markup Validator v0.8.0-dev. Latest Stable release of the validator was version 0.7.4, released 14 Nov, 2006.