Quote:
Originally Posted by Falkor
It seems no matter what I do, I'll never be able to achieve 100% compatibility.
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Yes, you can for novels, though after over 12 years of making ebooks I now won't bother checking mobi/KF7 compatibility. Only the Kindle K1, K2 and all the DX/DXG variants have to use mobi (encrypted version is azw without a digit) rather than azw3 or KFX on Amazon.
The secret is to realise that the ebook specs started out simply for simple novels with either images in their own paragraph and centred, or small. In both cases no frame in MS Word/LO Writer and "anchor as character". Superscript and subscript work if carefully styled. Forget things like
SMALL CAPS, raised caps, drop caps; anyway many readers don't like them they reduce reading comprehension and have erratic support. Accessibility is important, so alt text for every image and not trying to be clever or fancy.
If you are doing a text book, or fancy stuff in epub3, accept that it won't work for many and widespread commercial distribution will either be rejected or cause problems for purchasers.
Fixed layout suits more people as a PDF, but has to be avoided unless the content is only for large tablets. Most people want to read a novel on a phone. Personally I prefer a Kobo Sage for novels.
Graphic Novels / Comics / Picture books etc are better on large tablets. There are now ones with almost ebook battery life (if only reading) and non-glare screens as good as eink with a front light on. Drop caps, small caps, and other decorative devices can be appropriate in a picture book.