Detect IE8 Compatibility Mode [duplicate]
IE8 includes a trident token in the User-Agent string regardless of compatibility mode. See MSDN for more details: The Internet Explorer 8 User-Agent String (Updated Edition) IE7 on Windows Vista Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0) IE8 on Windows Vista (Compatibility View) Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Trident/4.0) IE8 on Windows Vista … Read more