title: `pointer-events: none;` does not work for iframe in Edge
body: <p>I'm applying <code>pointer-events: none;</code> on <code>iframe</code>, it works fine in all major browsers except for the Edge (tested with Edge 16).
  In Edge, I still can click anything inside the iframe. I've also tried to apply the styling to iframe's parent <code>div</code>, but nothing works.
  Note: I can't apply it inside of the iframe</p>
  
  <pre><code>&lt;div style="pointer-events: none;"&gt;
    &lt;iframe&gt;...&lt;/iframe&gt;
  &lt;/div&gt;
  
  &lt;iframe style="pointer-events: none;"&gt;...&lt;/iframe&gt;
  </code></pre>
  
  <p>Is there a workaround?
  Thanks!</p>