title: Does not display the image as a preview of the HTML video
body: <p>I have inserted in my video tag the code to show the preview with an image but this is not shown and I cannot understand why.</p>
  <p>This is the code:</p>
  <pre><code>&lt;video preload=&quot;none&quot; width=&quot;100%&quot; height=&quot;100%&quot; autobuffer=&quot;true&quot; controls=&quot;true&quot; poster=&quot;mypath&quot;&gt;
      &lt;source src=&quot;mypath&quot; type=&quot;video/mp4&quot;&gt;
  &lt;/video&gt;
  </code></pre>
  <p>This is what appears to me inside mozila firefox:</p>
  <p><a href="https://i.stack.imgur.com/lKJMO.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/lKJMO.png" alt="enter image description here" /></a></p>
  <p>I also tried on google chrome and the problem remains the same, what could be the problem?</p>