For a long time one of the main arguments between WHATWG (HTML 5 Living Standard) and W3C was that... W3C would copy HTML 5 specs, strip all copyright and contribution info, and post them to W3C site.
In more length: the term "HTML5" is widely used as a buzzword to refer to modern web technologies, many of which (though by no means all) are developed at the WHATWG. This document is one such; others are available from the WHATWG Standards overview.
Glad [1] to see that nothing changes.
[1] not