title: IE11 : cross iframe file handling
body: <p>I want to pass javascript File object from one iframe to another. The file is selected by the user with a dialogue box. 
  I pass the file using the following code in the destination iframe :</p>
  
  <pre><code>var file_selection_field = top.frames['sourceIframe'].document.getElementById('FileSelectionFieldId');
  var the_file = file_selection_field.files[0];
  </code></pre>
  
  <p>Then I slice the file and upload it to the server using AJAX.</p>
  
  <pre><code>the file.slice(index, index+chunk_size);
  // Ajax call ..
  </code></pre>
  
  <p>The problem is that once my source iframe is changed (and the file is still loaded in the destination iframe) I get "Script70:permission denied" error in IE11 when I call the slice function. </p>
  
  <p>Both iframes are at the same domain.</p>
  
  <p>Is there a way to solve it?</p>