title: Flash not work in iframe within sandbox attribute
body: <p>I've used <code>iframe</code> to show some pages.These pages may contain an <code>adobe flash</code> content like a video.
  my problem is that the <code>abode flash</code> doesn't execute in an <code>iframe</code> within sandbox attribute.
  my <code>iframe</code> tag :</p>
  
  <pre><code>&lt;iframe sandbox="allow-popups allow-pointer-lock allow-same-origin allow-forms allow-scripts" src="http://example.com"&gt;&lt;/iframe&gt;
  </code></pre>