It's just HTML with a bunch of extra, "semantic" attributes, and restrictions on what is allowed where. It will convert just as well as any other HTML file. From what I can see of it, it looks fairly pointless. Why didn't they just stick with some txt based markup? What's the point of using HTML and then restricting what you can do with it? Who is going to bother trying to remember the arbitrary set of restrictions they impose on their HTML? Did they not learn anything from the dozens of failed efforts to create "semantic" XML based markups.
Not to mention that there seems to be no data in that spec on how to organize resources like css and html files.
In any case, as I said, it will convert just as well as any other HTML file in calibre.
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