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In the meantime, my question is: Why does ePub validation fail on a file that works as intended on the devices used to read it? That seems to apply a standard far more restrictive than required to obtain the desired result.
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If you're asking why the validation services/programs are more strict than most rendering engines seem to be about ePub coding conventions, the answer is quite simple: because the opposite would be a disaster and "just as strict" is unattainable.