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Ha, that stood out to me too, but since I don't use them, I wasn't very confident that was the issue. Seems likely.
I also don't remember why I don't. It does kind of seem like a needless abstraction to use a multiple of the font-size of the html element rather than that of the element you're actually working with. If I had to guess, rems would be mainly useful for highly precise, grid- and baseline-oriented layouts, and those won't work for ebook where user controls would throw it all out of whack anyway.
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