title: Why does this line break IE11 and Edge?
body: <p>this code goes with a javascript video player.
  The question is about the line of code which I have commented out right now.  The line with onPlay...</p>
  
  <p>If that line of code is not commented out it breaks in IE11 and MS  Edge.</p>
  
  <p>There is no console error... our video player just never starts.   Any ideas on where to start?</p>
  
  <pre><code>events:
  {
      //onPlay: function() { setTimeout(() =&gt; player.stop(), 5000); },
      onStop: function() { this.player.play(); },
      onEnded: function() { this.player.play(); },
      onError: function() { this.player.play(); }
  }
  </code></pre>
  
  <p>If that line stays commented out... it works fine and the video plays.</p>