Comment by KingOfCoders
2 years ago
Tried to publish an epub to German platform Tolino, tried everything, tried an external service agency, etc. doctored around in Calibre, no success, they didn't accept the epub.
Printed PDF for decades at print shops, never had a problem.
Why is this such a problem? Because of the HTML?JS?
I believe epub is just a zip archive of html. Could you extract the files and then use a html validator which would cleanup the presumably broken markup?
My initial attempt would be to use pandoc to roundtrip the files.