I have problem with a website I am involved in development of when it is viewed in various older versions of IE including IE9 compatibility mode. I am not a Javascript developer so I need some advice on why this work in IE9 but not in compatibility mode. The following link is the best example.
http://www.hurdrolland.co.uk/architecture/
There is a javascript slider in place which you will see working in IE9 but when you switch to compatability mode is stops working completely.