185 websites
W3C Markup Validation Service
Checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.
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W3C Working Draft
A vocabulary and associated APIs for HTML and XHTML
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Web Font Gallery
A little gallery showcasing creative demos of web fonts combined with the possibilities of CSS 3
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webslide.me
webslide.me is a free HTML5 and CSS3 presentation framework
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WebSocket.org
A WebSocket Community
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WHATWG HTML Living Standard
WHATWG HTML multiple-page specification
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