title: IE11 quirks mode under Iframe - javascript errors
body: <p>I am reading and looking for answer for days and couldn't found one, hopefully this thread will bring salvation :)</p>
  
  <p>In my company we have a web app that is working on IE8.
  We are trying to migrate to IE11.
  We almost there but,
  We have an old module that is written in an old framework that is hosted in an iframe and running in quirks mode(define with meta http-equiv="X-UA-Compatible" content="IE=emulate7" or IE=5, I tried both).
  As long as the parent/main window is rendered in IE8 document mode (via  x-ua-compatible meta tag) or in enterprise mode, the iframe works fine.</p>
  
  <p>But as soon as I change the parent/main window to IE=9 and above, I get javascript errors from the child iframe (more than I can handle).</p>
  
  <p>I understand that IE11 uses emulator for quirks mode and not the real engine, but I can not find anywhere details about the javascript engine. 
  Does this mean that if the parent main window is rendered is IE9 and above, the child iframe will use ECMAscript 5 and not jscript as it should?</p>
  
  <p>is there any solution to my problem?
  thanks guys!</p>