Michele Calgaro via tde-devels wrote:
That could be a font selection issue. For the time being, unicode characters are correctly visualized if a proper font is selected. I still haven't worked on an auto-font selection when a glyph is not available in the current font. Can you install Unicode Upper font and check if that would display the symbols?
in my case the font is embedded in the epub file. I looked into it not very deeply, but my understanding is that this code is quite old and needs either replacement or update. I traced the encoding to embedded zlibrary which seems to be "borrowed" from fbreader, but both are from 2010 or 2012. Modern readers implement webkit or other html5 capable engines. But perhaps it doesn't have to do with html5, it should be "just" able to process the CSS and load the font :-) I may open a ticket and leave it for now.
