See also http://developers.whatwg.org/ http://developers.whatwg.org/, which does the same job but a: is better designed and b: is published by the WHATWG, so al

See also http://developers.whatwg.org/ http://developers.whatwg.org/, which does the same job but a: is better designed and b: is published by the WHATWG, so also includes bleeding-edge features not yet incorporated into the W3C specification.