Earlier quoted context omitted.
But no browser maker recognizes the W3C standard or claims to implement it, so what good is it?
That no browser maker recognizes W3C's standard is a bit misleading. MDN (i.e. Mozilla) quotes the w3c recommendations all over the place. Google, from what I found around, cites nothing, not even WHATWG. Webkit cites MDN (which cites w3c) as a source.
If there is an inconsistency between what the standards say and what the browsers have done, the browsers will more than likely trump the standards. In all practical senses the standards are descriptive, not prescriptive.