Quote:
Originally Posted by Quoth
Yes, ebooks especially KF7 were too US Centric. A solved problem 10 years before anyone made an eink reader.
The language support, decent LTR, RTL and vertical in one page.
I agree in theory many science textbooks should be possible, but some would be challenging on 6", even 300 dpi, never mind the old 800 x 600 or 167dpi screens.
All of that (bidi, asian, mathml) should have been in epub2. Absolutely short sighted it wasn't. I'd seen DOS text mode do bidi in 1980s.
Problem is as a publisher how do I know how many physical ereaders support mathml, Bidi and vertical? So we stick to epub2 for fiction and PDFs, ideally paper, for stuff that doesn't work on epub2. We test on real physical ereaders.
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Pretty much every textbook should work, even at 167dpi. Most monitors and laptop screens are far below 167dpi even a 4K 27" monitor is only 163ppi. Text looks better at higher dpi/ppi but it's perfectly tolerable to read math equations on a 90ppi monitor unless they're miniscule. But you have to have the text properly rendered and not png or jpegs at whatever size the publisher decided.
If you look at Kobo's site it's pretty clear even for English novels EPUB 3 is taking or has taken over. They tell you at the bottom of the page whether a book is EPUB 2 or 3.