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There seems to be a misunderstanding here that html for browsers equals epub for reading devices. They are NOT the same. Epub2 which is what most devices support includes only a subset of HTML and not HTML5 at all.
An example that pops up immediately just copying web pages is name. Name is not valid in epubs, id is what is used.
What an apple device supports particularly is not the same as what nearly all other devices support. And Hitch, a frequent poster here, and a professional epub maker, has pointed out the Apple's share of the epub market is quite small, so it takes some doing to find out what most devices support most of the time.
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