title: IE emulation : difference between “Document Mode” and “User Agent String”?
body: <p>I would like to simulate the rendering (especially the responsive behaviour) of my web pages in the different IE versions. I am using the emulation fonctionnality in the F12 toolbar.<br>
  But I don’t understand if I have to use both “document mode” and “user agent string”. What is the difference ?<br>
  If I select a document mode = IE7 and let user agent string to default, I obtain a jquery error.
  But, if I select a document mode > IE7 and select user agent string = IE7, it works. So, what is the good way to simulate ?<br>
  IE 11 is installed. What is simulated if I select “Edge” ?<br>
  Why is there no IE6 in Document Mode ?</p>