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The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards.

HTMLHelp.com is maintained by the Web Design Group to provide Web authoring reference material, tips, and answers to frequently asked questions.

HTML5 tutorial is a tutorial for beginners. Soon you

Learn CSS at the SitePoint CSS Reference. With full descriptions, working examples, and browser compatibility information on the entire CSS language.

Total Validator is an (X)HTML validator, an accessibility validator, a spell checker, and a broken links checker all rolled into one tool allowing one-click validation of your entire site.