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The World Wide Web Consortium (W3C) is an international community that develops standards to ensure the long-term growth of the Web. Read about the W3C mission.
The W3C Community has created useful Open Source Software. Try Unicorn, W3C's unified validator, to improve the quality of your pages. Unicorn includes the popular HTML and markup validator, CSS validator, mobileOK checker, and more. Become a validator sponsor.
The W3C cheatsheet provides quick access to CSS properties, WCAG tips, mobile tips, and more (also available on Android market).