force document mode

 
  http-equiv="X-UA-Compatible" content="IE=Edge">

For explanations, see http://hsivonen.iki.fi/doctype/#ie8 (it looks rather messy, but that’s because IE is messy in its behaviors).

http://stackoverflow.com/questions/10830894/how-to-force-ie9-to-render-in-ie9-document-mode