Duplicate footnotes:

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[^xxxxx]: foo

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<p data-sourcepos="1:1-1:17"><sup data-sourcepos="1:1-1:8" class="footnote-ref"><a href="#fn1" id="fnref1">[1]</a></sup> <sup data-sourcepos="1:10-1:17" class="footnote-ref"><a href="#fn1" id="fnref2">[1]</a></sup></p>
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<section class="footnotes">
<ol class="footnotes-list">
<li data-sourcepos="3:1-3:13" id="fn1" class="footnote-item">
<p data-sourcepos="3:11-3:13">foo <a href="#fnref1" class="footnote-backref">↩︎</a> <a href="#fnref2" class="footnote-backref">↩︎</a></p>
</li>
</ol>
</section>
