The World Wide Web Consortium (W3C) is an international consortium where Member organizations, a full-time staff, and the public work together to develop Web standards. W3C primarily pursues its mission through the creation of Web standards...
The W3C QA Toolbox - Validators, checkers and other tools for Webmasters and Web Developers. Home of the HTML and CSS validators, link checker, and more.
A one-stop validator including a HTML validator, an accessibility validator, a spelling validator, a broken links validator, and cross-browser compatibility validation through screenshots
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