Quote:
Originally Posted by Sil_liS
Is there some rule saying that an epub3 file has to use all the things that epub3 can use?
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No. But the ePub 3 standard has a long list of things that a reader is
required to support - far more than Apple need for what they've created iBooks Author for. ie, to create a reader which they could call an ePub 3 reader would have needed a far, far greater investment, with little or no benefit in return.