That's a fair point HarryT, but how many years away do you think we are? It a relatively new spec, but there is no reason to think its not in the process of being implemented by various readers out there. Just as HTM5 is slowly coming up to speed in the major browsers EPUB3 will probably be here before we know it. I don't think we are a "long, long" way off which was the context in which I was replying.
All it takes is for someone in the competitive space like a Cool Reader to implement and a lot of their competitors will feel the pressure to get their implementation going.
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