```
% pandoc --id-prefix=foo
This.^[Has a footnote.]
^D
<p>This.<a href="#foofn1" class="footnote-ref" id="foofnref1"
role="doc-noteref"><sup>1</sup></a></p>
<aside id="footnotes" class="footnotes footnotes-end-of-document"
role="doc-endnotes">
<hr />
<ol>
<li id="foofn1"><p>Has a footnote.<a href="#foofnref1"
class="footnote-back" role="doc-backlink">↩︎</a></p></li>
</ol>
</aside>
```