So in here in this post, there are references denotated as a small "1", "2" and so on.
When hovering over it with the mouse a small textbox appears saying the same thing as at the bottom of the page.

What html code would be used? xD

http://www.alljapaneseallthetime.com/blo...-standards

In the article where he makes the link to the footnotes:
<a class="simple-footnote" title="Whatever goes in the mouseover" id="return-note-6004-1" href="#note-6004-1">¹</a>.

Then the footnote:
<li id="note-6004-1">Whatever the footnote says<a href="#return-note-6004-1">Return Link</a></li>

Asriel Wrote:In the article where he makes the link to the footnotes:
<a class="simple-footnote" title="Whatever goes in the mouseover" id="return-note-6004-1" href="#note-6004-1">¹</a>.

Then the footnote:
<li id="note-6004-1">Whatever the footnote says<a href="#return-note-6004-1">Return Link</a></li>

Thank you! xD