Quote:
Originally Posted by MicroDrie
Unfortunately, no one knows which E-reader supports which CSS commands. That makes it all very difficult to make EPUB that can do something more than bold, italic and underlined text.
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There were quite extensive tests done over the years.
epubtest.org tested devices/apps from ~2014-2018. I wrote about it earlier this year:
"Overview of features supported by ebook readers?" (Post #30)
The website died for a few years, and is back (but it's a shell of its former self). Perhaps they'll get back into releasing more detailed tests/info... but you can easily use Archive.org to look at all their older information—a ton of it is still relevant.