#w3c
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Micropub is now a @W3C CR. Congratulations to @aaronpk and all the #indieweb contributors. https://aaronparecki.com/2016/08/23/2/micropub-cr
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HTML 5: The Markup Language
Tag-by-tag guide to HTML5Categories
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WCAG Cheatsheet
Checklist for compliance with each of the three prioritiesCategories
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HTML5 differences from HTML4
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DOCTYPEs and their Respective Layout Modes - The Web Standards Project
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HTML Slidy
Slideshows in XHTML from W3CCategories