Let's try it a different way;
Please convert this HTML:
https://pastebin.com/Quk0kqxh
into the ePUB.
And the output of the footnote should look like this:
Notice how the footnote number is styled as a superscript. Is smaller and higher than the rest of the text.
Can anyone do that using Calibre with that HTML?
If yes, how?
When I tried the footnote appeared like a regular text size, not a superscript. And it is because Calibre removes classes from footnote links.