Quote:
Originally Posted by dgatwood
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). 
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True, and it has no real advantage then over ePUB2. It will take a lot more work.