Additional notes on hover?

Hello.

I was wondering whether it could be possible to add a feature where the learner could hover on a work/concept they don't know and trigger a small text bubble with a brief description of that concept.

Right now, since there are no footnotes, we usually have to add hyperlinks to external sites where they explain those concepts. I think it would be way better for us to offer our own explanations/notes on these concepts, not to mention it would mean less effort on the learner's part, who would not need to leave the page.

Would this be possible?

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