Internet Explorer 9

Internet Explorer 9 is the ninth version of Internet Explorer, the worst browser ever, released on 14 March 2011 for Windows Vista and Windows 7 (it did not have a corresponding Windows release). Internet Explorer 9 brings focus towards HTML5 and JS standards. It adds a new byte code JavaScript engine, Chakra.

Windows 8 build 7700 is currently the earliest leaked build to have an early version of Internet Explorer 9, though the application is still labeled as Internet Explorer 8.