http://stackoverflow.com/questions/5302302/php-if-internet-explorer-6-7-8-or-9

‘Else’ for an IE HTML Condition

(note the use of <!-- -->):

<!--[if lt IE 9]>
  This is less then IE9
<![endif]-->
<!--[if gt IE 8]> <!-- -->
  this is all browsers: IE9 or higher, firefox, chrome, etc.
<!-- <![endif]-->
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