Footnotes (asterisks, numbers, etc.) appear highlighted in gray - a single tap brings one to the note, and tapping on the asterisk/number at the note itself brings the reader back to the text. My current book has been a bit wonky getting back, so I've had to go to OPTIONS --> History a couple of times for that.
I've encountered a couple of books with "dead" footnotes, but wasn't bothered as they were for citations only, not clarifications/explanations.
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