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from the link you gave: "@roger64: Many apps, for example Calibre, use heuristics to detect footnotes and display them in popup windows. I.e., you won't have to convert your ePub2 books to ePub3 books to get popup footnotes."
What about for Kindle?? Do I need to convert to epub3 first?
"when compiled with KindleGen"
So it won't work if I convert using Calibre? Anyway, I will go and try it out.
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