Re: HTML is a declarative mark-up language from Leif Halvard Silli on 2009-01-29 (public-html@w3.org from January 2009)
And may be the spec doesn't need to be optimised for HTML guide authors either. They can treat HTML 5 as a black box too, and just read HTML 4 etc for the things that are obviously lacking in HTML 5. And in general. Authors can dig.
Mais c'est bien ce qui est demandé, HTML 5 est le nouveau XAML :-D

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