So there are two aspects of interest:
1. Do producers of ereaders really implement their firmwares in such a manner that epubs conforming to the standards are surely displayed correct?
2. If I test some ebooks from shops that sell them without DRM epubcheck also issued a lot of errors. So there is the question, how many epubs commercially sold are really formated according to the standards. (So that we will be able to read them using firmwares developed in 5 years ;-) )
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