Quote:
Originally Posted by Toxaris
The support for ePUB3 is scarce. Every reader and app supports ePUB2 and will continue to do so, because it is much easier. This is especially true for e-ink readers. Building and creating ePUB2 is also easier, since the most used editors support ePUB2 much better than ePUB3.
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To be pedantic, it is possible to build EPUB 3 books that are mostly backwards-compatible with EPUB 2 readers. You just have to put in lots of optional segments in the various metadata files and leave out all of the features that make EPUB 3 interesting (e.g. scripting).