HTML5
This specification evolves HTML and its related APIs to ease the authoring of Web-based applications. Additions include context menus, a direct-mode graphics canvas, a full duplex client-server communication channel, more semantics, audio and video, various features for offline Web applications, sandboxed iframes, and scoped styling. Heavy emphasis is placed on keeping the language backwards compatible with existing legacy user agents and on keeping user agents backwards compatible with existing legacy documents./http://www.w3.org/html/wg/markup-spec/
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http://dev.w3.org/html5/html-author/
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