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We have had this argument before. Epub3 is the leading format in Japan, and in countries with rtl, and vertical languages, is much better for accessibility in many ways and allowing synchronized reading of audio with text, and of course a broad range of video. Epub3 can be converted to Kindle formats as well. Is supported by Readium SDK, the Thorium Reader, ADE 3, iBooks, etc.
Epub2 is basically dead outside the US and a few other places stuck with slow and old devices. Good riddance.
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