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"Support" and "Support the whole spec" are different issues, while pretty much everyone has 95% of EPUB2, all of the EPUB3 implementations are only basic subsets, EPUB3+audio/video tags, woo hoo - or some abortion to support scripting for the platform specific files.
Really, it's an overcomplicated and unrealistic spec. Throw out nearly all of its dynamic/script stuff (wrangle the common uses to actual tags), that'd have been a better plan than the behemoth of EPUB3.
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