title: Youtube - Full screen is unavailable
body: <p>The problem is that I can not play YouTube movies in fullscreen. I am getting the following error: "<em>Full screen is unavailable</em>" (<a href="https://gyazo.com/159b3f51db4bb643e6ef10854b18ddd0" rel="noreferrer">https://gyazo.com/159b3f51db4bb643e6ef10854b18ddd0</a>, see screenshot)</p>
  
  <p>I've tried it in multiple browsers and only one of them is working:</p>
  
  <ul>
  <li>Internet Explorer 10 (versie 10.0.9200.16921) <strong>WORKING</strong></li>
  </ul>
  
  <p>The rest of the internet browsers is not working:</p>
  
  <ul>
  <li>Internet Explorer 11 (versie 11.306.10586.0) <strong>NOT WORKING</strong></li>
  <li>Firefox (versie 46.0.1) <strong>NOT WORKING</strong></li>
  <li>Google Chrome (versie 50.0.2661.102 m <strong>NOT WORKING</strong></li>
  <li>Google Chrome (versie 30.0.1700.102 m <strong>NOT WORKING</strong></li>
  </ul>
  
  <p>Why is it working in an older Internet Explorer and all new browsers are not?</p>
  
  <p>Also "<em>allowfullscreen</em>" is getting removed when I save in my editor and parameters like "<em>allowfullscreen="true"</em>" are also not working. </p>
  
  <pre><code>&lt;iframe width="560" height="315" src="https://www.youtube.com/embed/Gl7ABg9lnBM" frameborder="0" allowfullscreen&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>I really don't know what is causing the problem so I hope you guys can help me out!</p>