Quote:
Originally Posted by Barty
You have to tell the reader which font you want to be used for which. I don't know how you'd do that except by editing the markup
One possibility is you can embed a font that supports only Chinese and set that as default font for the book (this requires editing the book, obviously), and let the reader use the font you select in the reader UI as fall back font for Vietnamese. Or vice versa
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I've done this before with Chinese in English texts (as part of footnotes in books translated from Chinese to English, primarily), and if you go this route, you should absolutely subset the embedded font to only contain the characters you need - because of the large number of glyphs in Chinese fonts, the file sizes are waaaay bigger (for example, basic Noto Serif is ~200kb for each weight. Noto CJK is around 5mb for each weight).