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i think (not sure of this, though) that epub3 was designed with the capability of being backwards compatible with epub2, should the producer of the ebook adhere to the recommended practices. adhering, however, is totally another issue.
progression to epub3 is inevitable. it is based on html 5 with more advanced css support and other elements such as audio and video,though both audio and video is iffy given that most up to date e-ink readers are doing away with audio ports and we know that e-ink can't really handle video. it should work fine on non-e-ink tablets, however.
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