Quote:
Originally Posted by kovidgoyal
The only people that really need EPUB 3 are people that want to create EPUBs that have to pass epubcheck. Passing epubcheck is meaningless, but unfortunately some EPUB stores require it so people that want to sell books in those stores need it.
Other than that pretty much everything you can do in EPUB 3 you can do in EPUB 2, because both are ultimately rendered using the same browser engines.
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Minor nits. Epubcheck will pass an epub2 as easily as an epub3. Both versions are supported -- somebody had to use the version information.
As for rendering epub2 vs. epub3, there may be a renderer that handles both versions properly but I haven't found it yet. Likely the reason that Kobo uses two renderers with the software for their eInk devices.
The only epub3 books I've found that really needed to be epub3 are either displaying languages that don't read RTL, top to bottom (Japanese vertical with furigana as an example) or are using fixed layout.