Quote:
Originally Posted by Jellby
Using named entities may be problematic in epubs, but the black boxes are probably due to the font lacking those characters, or to a buggy renderer, every Unicode character is allowed in epubs.
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Exactly, a box is a clear indication of a missing font. All of unicode is permitted but few eBook readers (if any) have all the font glyphs in their repertoire. You can embed a font set to fix this.
Dale