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W3C Markup Validation Service 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.
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W3 Schools Web building references, tutorials, and examples for all things web (HTML, DHTML, css, XML, DOM, SOAP, .NET, and many others
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