Quote:
Originally Posted by Jellby
Failure to pass epubcheck means that, if your book does not display fine, you cannot blame the reader 
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Yes you can, your file is most likely not displaying in the reader for reasons that have nothing to do with the errors epubcheck is pointing out.
But maybe my perspective on this issue is somewhat different, since I don't hand create EPUB files. Instead I hand create an e-book in TXT or HTML and auto generate the EPUB from that. So things like checking the NCX and OPF files for validity are not important to me, all that's automatically taken care of