Quote:
Originally Posted by Quoth
Also many ebooks use pt, because Wordprocessors don't use em. All correctly rendering engines simply regard 12pt = 1em, thus everything is relative as intended. The purely Kobo proprietary kepub doesn't do this with pt, which is a bug. I've not figured out exactly what it was doing and kepub may treat pt on margins and font sizes differently, so I gave up and switched to epub for Kobo. All ebooks then have relative font sizes and margins as intended, no matter if pt or em.
However you have a choice. I now convert all ebooks added to Calibre anyway to automatically remove line-height and other stupidity. Sometimes I have to manually fix azw3, but only from the house of random penguins. So I have no problem with Standard eBooks epubs.
Calibre gives choice. It quick and trivial to have epub or automatically send kepub to a Kobo, so the same epub is sent as epub to Sony, Boyue, Apps, Y-ben, Binatone etc. I copy a load of PD ebooks to other family members. Not all have Kobos and some get azw3.
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The problem with Standard Ebooks and Kobo with ePub is that because of the way they do their ePub, the CSS is taken as having an error and the entire CSS is ignored.