W3C Feed Validation Service, for Atom and RSSThis is the W3C Feed Validation Service, a free service that checks the syntax of Atom or RSS feeds. The Markup Validation Service is also available if you wish to validate regular Web pages.
The W3C Mobile Checker
The alpha service of the new Mobile Checker has been retired. Be mobile friendly The Mobile Checker is a tool for Web developers who want to make their Web page or Web app work better on mobile devices. Learn more. Contribute Looking to contribute to Mobile Checker? There are many ways to get involved in its development. Please take a few minutes to read this document to understand how you can hel
W3C standards and drafts
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