It's an HTML thing. Perhaps it could be explained better.
It means something like this:
[code]<div class="footnote">I am a footnote.</div>
That div(ision) has the classname "footnote".
Also see the description:
Quote:
Show footnotes with classic classnames at the bottom of pages.
This tweak can be duplicated as a user style tweak when books contain footnotes wrapped with other class names.
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