Michelle Barker is onto an excellent idea in Progressively Enhanced Popover Toggletips. Her idea is that footnotes are the perfect sort of thing to make popovers. You know popovers: It’s like when I put a superset1 number in a sentence (like I just did) and then link it down to the bottom of the post to explain something in more detail which would have been distracting detail to put in the paragraph itself.
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