Email Standards Project : The Email Standards Project is about working with email client developers and the design community to improve web standards support and accessibility ...
&what: Discover Unicode & HTML Character Entities : amp-what is a quick, interactive reference of 14,500 HTML character entities* and common Unicode characters, 8859-1 characters, quotation marks, punct...
AlsacréationS : Alsacréations est une communauté dédiée à l'apprentissage des standards web (W3C, HTML, XHTML, CSS) ainsi qu'à l'accessibilité numérique
This site provides a collection of schemas that webmasters can use to markup HTML pages in ways recognized by major search providers, and that can also be used for structured data interoperability (e.g. in JSON).
Mobile HTML5 compatibility : HTML5 compatibility on mobile and tablet browsers with testing on real devices
Ionic : The beautiful, open source front-end SDK for developing hybrid mobile apps with HTML5.
The HTML5 Shiv : The HTML5 Shiv enables use of HTML5 sectioning elements in legacy Internet Explorer and provides basic HTML5 styling for Internet Explorer 6-9, Safari...
CSSdoc : This is a draft to bring automatic documentation to CSS files, like its known for JavaScript and PHP files through JavaDoc/DocTags.
Mobello : Mobello is high performance javascript UI framework for HTML5 mobile app