Implementations in Web browsers
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List of known implementations of HTML 5 in web browsers (list is incomplete, feel free to extend it)
For summary see Comparison of layout engines (WHATWG) in Wikipedia.
- canvas with some limitation implemented in Firefox, Opera, Safari, and Konqueror 4, with ExplorerCanvas emulated in Internet Explorer 6/7
- getElementsByClassName implemented in Firefox 3
- Client-side session and persistent storage implemented in Firefox 2
- Custom content handlers partially implemented in Firefox 2
- ping attribute implemented in Firefox 3
- cross-document messaging implemented in Opera 9, Safari and Firefox 3
- Audio interface implemented in Opera 9, Konqueror 4
- video element basic implementation in experimental Opera build and experimental Firefox build; with mv_embed script in every browser with Java support
- Server-sent DOM events implemented in Opera 9
- contenteditable attribute implemented by Opera, Internet Explorer, Safari and Firefox 3
- Drag & drop (partially) implemented in Internet Explorer and Safari.
Web Forms 2.0
- Opera 9 fully implemented Web Forms 2.
- Firefox 2 implemented input event (there is still bug #195696)
Emulation of WF2 in browsers
- date input element with input-type-date works in Firefox, IE6/7, Safari
- Repetition Model - Opera 9 (native), with repetitionmodel works in Firefox, IE6/7, Safari 2.0.4
- Project  emulate in IE6/7 validation, date and time types, range, repetition, calculated fields, datalist, autofocus.
Web Controls 1.0