=== HTML ===
<h1 id="title-one">Title One</h1>
<p>Some <a rel="noopener noreferrer" href="https://example.com">link</a> here.</p>
<h2 id="sub--head">Sub &amp; &#34;head&#34;</h2>
<h3 id="deep">Deep</h3>
<p>Text.</p>
=== TOC ===
<div class="toc">
<ul>
<li><a rel="noopener noreferrer" href="#title-one">Title One</a>
<ul>
<li><a rel="noopener noreferrer" href="#sub--head">Sub &amp; &#34;head&#34;</a>
<ul>
<li><a rel="noopener noreferrer" href="#deep">Deep</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>