Thanks for the popup window clarification. I only use kepubs and I really like the presentation in a separate popup window,
There are a lot of books that have been published with the included annotations as the chief reason for the new edition.These books typically have the word "annotated" included in the title. I am a big fan of annotated books and, in general, the term annotation is more generally used as a critical or explanatory commentary. So I guess it would be a sub-category of footnote.
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