I would also have to parse the ncx toc to get the info for missing titles instead of the nav, skip epub:type injection, and then skip the aria role assigment as well.
So for right now, I will focus on epub3 only and getting that to work properly with a gui to allow easy editing of alt attributes, and improving semi-automatic semantic epub:type generation and role addition.
Once that is all working, I will change the code to relax the epub3 only restriction.
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