<meta http-equiv="X-UA-Compatible" content="IE=8" /> should force your page to render in IE8 standards. The user may add the site to compatibility list but this tag will take precedence.
Attention in classroom
<meta http-equiv="X-UA-Compatible" content="IE=8" /> should force your page to render in IE8 standards. The user may add the site to compatibility list but this tag will take precedence.