title: HTML5 video tag works in Explorer 11.494 but not in 11.545 (But not really?)
body: <p>There are two machines with Internet Explorer 11.545 except mine, which is 11.494. I've embeded video with the <code>video</code> tag.
  It works on my machine (seemingly with HTML5), but not on the other two machines, which run the slightly newer version.</p>
  
  <p>I've tried polyfilling (Video for Everybody), and it still doesn't work.</p>
  
  <p>Other than that it works for both Chrome, Edge and Firefox on all machines.</p>
  
  <p>EDIT: I've now tried with another machine with 11.494, and it doesn't work? I am now utterly confused</p>
  
  <pre><code>&lt;video width="300" height="169" controls preload="metadata"&gt;
      &lt;source src="./videos/2016-Vidéo corporative GESTESS.mp4" type="video/mp4"&gt;
      &lt;source src="./videos/2016-Vidéo corporative GESTESS.mp4" type='video/mp4; codecs="avc1.4D401E, mp4a.40.2"'&gt;
      &lt;object type="application/x-shockwave-flash" data="http://releases.flowplayer.org/swf/flowplayer-3.2.1.swf" width="300" height="169"&gt;
          &lt;param name="movie" value="http://releases.flowplayer.org/swf/flowplayer-3.2.1.swf" /&gt;
          &lt;param name="allowFullScreen" value="true" /&gt;
          &lt;param name="wmode" value="transparent" /&gt;
          &lt;param name="flashVars" value="config={'playlist':[{'url':'.%2Fvideos%2F2016-Vid%C3%A9o+corporative+GESTESS.mp4','autoPlay':false}]}" /&gt;
      &lt;/object&gt;
  Your browser does not support the video tag.
  &lt;/video&gt;
  </code></pre>