title: onload in iframes not working, if iframe have non-html document in src (pdf or text)
body: <p>I have iframe with onload handler:</p>
  
  <pre><code>&lt;iframe id="FrameForPrintVersion" src="" border="0" style="height:0; width:0; visibility:hidden;" onload = 'frameOnload()' &gt;
  </code></pre>
  
  <p>It works fine if i use html-pages as the source of the iframe, but not when i set src to any pdf document.
  Is it posible to handle when a PDF document was loaded in this case? </p>