iBooks is not more flexible with ePUB, you are mistaken in that. In fact, it is less flexible. They should write a specific rendering engine for ePUB, but instead they use a xhtml-renderer, which is not the same.
That results standard, perfectly good ePUB coding not supported and non-standard ePUB coding being supported. It is the other way round.
There could be a reading application on Android which uses the same lazy method like Apple, but I wouldn't count on it. Apple took the easy way and decided to support only the ePUB features they like and add some things which are not in the specifications.
fortunately there are reading applications for the ipad that support the specifications better.
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