I use an iframe to show a preview of my application. It work great in Firefox and Chrome, but in IE it throw an "unspecified error" and the application is not loaded displaying a blank page instead.
The error is at line 2962:
$( document.activeElement || "" ).add( "input:focus, textarea:focus, select:focus" ).blur();
It seem that in IE document.activeElement throw an unspecified error instead or returning null when loading an iframe. Wrapping the line in a try catch seem to fix the issue.
I have the same problem in IE9, IE8 seems to work fine though