"The east-european accented characters are not displayed properly in Adobe based parsers (used in most eInk based readers) unless the font is not embedded in the epub. Unless Adobe does not change its parser, along with the ones in the devices, it would be nice to have the font embeddig possibility."
Found this comment related to a SIGIL enhacement request: adding the posibility of embedding fonts in ePUB CSS styles because of the former.
Try a document with a "System" font such as ARIAL, TIMES NEW ROMAN, etc..
and another one with an "exotic" font to see what happens.
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