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Assume
1) No vertical scrolling
2) Many epub3 features won't work.
Have both the epub3 and epub2 indexes.
Test on an epub2 based eink.
Test also mobo and azw3 on an eink Kindle. Amazon has more than 90% of ebook market and while upload is epub, the download is mobi, azw3 or KFX. Maybe 1/2 of ebooks (Amazon app included) are read on phones.
Almost everything "works" in desktop viewers, but they are not typical.
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