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validator.w3.org

The W3C Markup Validation Service

W3C's easy-to-use HTML validation service, based on an SGML parser.
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#1 in Computer General, #1 in Validation, #1 in W3C, #1 in Web Site Tools, #1 in XHTML, #2 in HTML CSS, #2 in Web Programming, #3 in WWW, #5 in Web Standards, #5 in Web Tools
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