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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, MobileOK content, or to find broken links, there are other validators and tools available.
What is the Markup Validator and what does it do? The Markup Validator is a free tool and service that validates markup: in other words, it checks the syntax of Web documents, written in formats such as (X)HTML. The Validator is sort of like lint for C. It compares your HTML document to the defined syntax of HTML and reports any discrepancies.
This validator can process documents written in most markup languages. Supported document types include the HTML (through HTML 4.01) and XHTML (1.0 and 1.1) family, MathML, SMIL and SVG (1.0 and 1.1, including the mobile profiles).
If your document is on the Web, you can validate it with the same advanced options by entering its address instead. W3C's easy-to-use markup validation service, based on SGML and XML parsers.
The W3C Markup Validator provides Perl/CGI/SGML/XML/DTD-based validation of a variety of document types. SGML and DTDs are older technologies that never found wide use on the Web, so for checking of HTML documents using modern technologies, you probably want to instead use the W3C HTML Checker .
An introduction to concepts of SGML, DTDs and formal validation, and how they apply to the Validator, with links to further information. W3C's easy-to-use markup validation service, based on SGML and XML parsers.
W3C's easy-to-use markup validation service, based on SGML and XML parsers.
Releasing version 0.8.0 of the W3C Markup Validator, a major milestone in the development of the validator, including changes in its architecture, UI, new features and fewer bugs, for a better, more accurate and helpful quality process.
W3C HTML Checker out=xml format. W3C HTML Checker out=gnu format. Also available is historical documentation about the obsolete SOAP 1.2 API for the Markup Validator (which you should no longer use). W3C's easy-to-use markup validation service, based on SGML and XML parsers.
Below is a listing of W3C's various validation services, links to the services themselves, the user-agent header being sent and how to find out more information on each. Markup Validator Service