title: after closing popup with window.close() and the unload event not firing in IE 11
body: <p>From the parent page, I have opened a popup using window.open.</p>
  
  <p>Then in the popup, I am trying to close the popup with window.close and on unload, trigger a click in the parent page. </p>
  
  <p>Code in popup.aspx.cs:</p>
  
  <pre><code>ClientScript.RegisterStartupScript(typeof(Page), "closePage", "&lt;script type='text/JavaScript'&gt;window.close();&lt;/script&gt;");
  </code></pre>
  
  <p>Code in the popup.aspx</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
  window.onunload = triggerclick;
  function triggerclick()
  {
  var b = window.opener.document.getElementById('ctl00_PageContent_UpdateButton1');
  b.click();
  return false;
  }
  &lt;/script&gt;
  </code></pre>
  
  <p>It works fine in FF and chrome, but not in IE 11. Any suggestions on how to tackle this issue? Thanks in advance.</p>