Visible footnote headings

Used footnote headings enter reference lookup; unused definitions do not.

Generated from resources/examples/edge-cases.md - edit the cases there, not here. Each case links the conformance fixture it produces.

Visible footnote headings

4 conformance fixtures

• 741-visible-footnote-headings
• 741-visible-footnote-headings-2
• 741-visible-footnote-headings-3
• 741-visible-footnote-headings-4

x[^n]

[^n]: # H

[H][]

<p>x<a id="fnref1" href="#fn1" role="doc-noteref"><sup>1</sup></a></p>
<p><a href="#H">H</a></p>
<section role="doc-endnotes" aria-label="Footnotes">
  <hr>
  <ol>
    <li id="fn1">
      <h1 id="H">H</h1>
      <p><a href="#fnref1" role="doc-backlink" aria-label="Back to reference">↩</a></p>
    </li>
  </ol>
</section>

[^n]: # H

[H][]

<p>[H][]</p>

x[^n]

[^n]: # H

</#H>

<p>x<a id="fnref1" href="#fn1" role="doc-noteref"><sup>1</sup></a></p>
<p><a href="#H">H</a></p>
<section role="doc-endnotes" aria-label="Footnotes">
  <hr>
  <ol>
    <li id="fn1">
      <h1 id="H">H</h1>
      <p><a href="#fnref1" role="doc-backlink" aria-label="Back to reference">↩</a></p>
    </li>
  </ol>
</section>

[^n]: # H

</#H>

<p>&lt;/#H&gt;</p>