title: CKEditor 5 showing video element, but plain HTML inserted in a div does not show the element
body: <p>I am creating a lesson editor. The user can edit the content (text, videos, links, images etc) or view the final result (the rendered html).</p>
  
  <p>The editor works fine, but when I show the rendered html the linked youtube videos are not visible.</p>
  
  <p>This is the editor part, as you can see the video linked is visible:</p>
  
  <p><a href="https://i.stack.imgur.com/s0wvl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/s0wvl.png" alt="enter image description here"></a></p>
  
  <p>And this is the 'rendered' version; the video is missing (it looks like it's not rendering the <code>figure</code> tag and the <code>oembed</code> tag, but why?):</p>
  
  <p><a href="https://i.stack.imgur.com/qnMm5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qnMm5.png" alt="enter image description here"></a></p>
  
  <p>The html is:</p>
  
  <pre><code>&lt;h2&gt;This is the header of this section&lt;/h2&gt;
  &lt;figure class="media"&gt;
  &lt;oembed url="https://www.youtube.com/watch?v=7km4EHgkQiw&amp;amp;list=RDQK-Z1K67uaA&amp;amp;index=9"&gt;&lt;/oembed&gt;
  &lt;/figure&gt;
  
  &lt;p&gt;Please let the student introduce himself.&lt;/p&gt;&lt;blockquote&gt;&lt;p&gt;&amp;nbsp; ‘I was in no mood for talk and I was unpleasantly surprised to find Judy Poovey brushing her teeth at the sink. […]&lt;br&gt;‘Hi, Richard,’ she said, and spit out a mouthful of toothpaste. She was wearing cut-off jeans that had bizarre, frantic designs drawn on them in Magic Marker and a spandex top which revealed her intensely aerobicized midriff.&lt;br&gt;‘Hello,’ I said, setting to work on my tie.&lt;br&gt;‘You look cute today.’&lt;br&gt;‘Thanks.’&lt;br&gt;‘Got a date?’&lt;br&gt;I looked away from the mirror, at her. ‘What?’&lt;br&gt;‘Where you going?’&lt;br&gt;By now I was used to her interrogations.’ (pp. 51-52)&lt;/p&gt;&lt;/blockquote&gt;
  
  &lt;figure class="media"&gt;
  &lt;oembed url="https://www.youtube.com/watch?v=7km4EHgkQiw&amp;amp;list=RDQK-Z1K67uaA&amp;amp;index=9"&gt;
  &lt;/oembed&gt;
  &lt;/figure&gt;
  </code></pre>