W3C Markup Validation Service

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Markup Validation Service

The W3C Markup Validation Service, also known simply as "HTML Validator is a free online service that helps check Web documents in languages such as HTML, XHTML, SVG, MathML, etc. Its source code is also available, and it is relatively easy to install on a number of platforms.

• http://validator.w3.org/source/
• http://validator.w3.org/