footnotes

In the Docutils Quick Reference Guide, I find the following with respect 
to footnotes.


Footnote references, like [5]_.
Note that footnotes may get
rearranged, e.g., to the bottom of
the "page".

.. [5] A numerical footnote. Note
    there's no colon after the ``]``.


Does anyone know what determines where footnotes appear in the resulting 
HTML file? I'm finding that, if I insert a footnote as shown in the 
example, the footnote will appear in the resulting document right below 
the paragraph containing the footnote reference. I prefer footnotes at 
the end of the HTML document. To obtain this, I put the actual footnote 
text at the end of the source code document. But, on a long document 
with more than a few footnotes, I can lose track of my footnotes. If I 
want to move footnotes around, finding the footnote text that links with 
the footnote reference can be a challenge.

With MarkDown Extra, footnotes always appear at the end of the document 
even if I put them right after the reference paragraph in the source 
document.

So, what determines whether a footnote gets "rearranged, e.g., to the 
bottom of the 'page'"?

For my browser, I'm using Mozilla Firefox on Ubuntu Linux.

Virgil

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