Grouping Content Elements
html.spec.whatwg.org/multipage/grouping-content.html
p, hr, pre, blockquote, ol, ul, menu, li, dl, dt, dd, figure, figcaption, main, div
<p> </p>
<hr>
<pre> </pre>
<blockquote> </blockquote>
<ol> </ol>
<ul> </ul>
<menu> </menu>
<li> </li>
<dl> </dl>
<dt> </dt>
<dd> </dd>
<figure> </figure>
<figcaption> </figcaption>
<main> </main>
<div> </div>