|Web Sockets and Messaging, WebRTC||Drag and Drop, Fullscreen|
|Canvas, SVG, WebGL||Animation Timing, Media, Pointer Lock, Web Audio|
|File API, File System API, Indexed DB, Offline, Web Storage||Browser, Shadow DOM, Typed Arrays, Web Workers|
|DOM||CSS Object Model, Selectors|
Some links and summaries are still missing (some specs unfortunately don't use ids that can be inferred), but all the types and signatures should be there already (issue tracker).
You may also be interested in the html5index github project. If you'd like to contribute or have ideas or suggestions, contact me via G+.
*) This site relies on HTML frames. If you don't see the index of libraries and types to the left of this document, load the full frame set by following this link.