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Originally Posted by DiapDealer
There is no such things as an EPUB3 "wrapper." An EPUB3, is an EPUB3, is an EPUB3. EPUB3 is not defined by "containing non-EPUB2 compatible content." It's not any-less EPUB3 because it doesn't contain any multimedia or because it chooses not to make use of all meta-data elements available to it.
Most EPUB2s don't contain every single type of content and metatdata that EPUB2s CAN contain. Does that make them any less EPUB2?? Of course not. That line of thinking would be silly. As silly as suggesting a text-only EPUB3 is somehow an EPUB2 in your imaginary "EPUB3 wrapper."
The EPUB3 spec is inherently backward compatible with EPUB2 reading systems (so long as an OPF is present -- and they always are in commercial EPUB3s).
Your 1% is meaningless, because your "EPUB3-specific" and your "EPUB3 wrapper" are equally meaningless terms. There is tons of content being sold commercially by epub vendors as EPUB3, and tons of Kindlebooks are created from EPUB3s. The notion that they are "fringe" is not even a little bit accurate. Not any more. Get over your irrational and imaginary aversion to all things EPUB3 already. It's tired.
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It's easier to make ePub 2 eBooks and there is no need for ePub3 unless the eBook uses some feature not supported by ePub2 that's needed for the eBook. ePub3 is a mess and ePub2 was rushed. Take most ePub3 eBooks and convert them to ePub2 and you lose no functionality at all. So why bother to make ePub3? all you get is more code that you don't need.
True ePub3 may never take off because most reading software doesn't support it. And yes, these ePub3 are just ePub2 in an ePub3 wrapper.