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Lanny,
As with any other file format, standards are open to debate. Every ebook viewer (hardware or software) implements a slightly different set of standards, in slightly different ways - regardless of what the various file format specifications actually say. Meanwhile, everyone is claiming someone else's implementation is wrong and things should be done their way. In other words, it's the "Browser Wars" of a decade past all over again.
Expect things to start working properly in a minimum of 5 years.
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