IE9 array does not support indexOf

Question

Based on http://ie.microsoft.com/testdrive/HTML5/ECMAScript5Array/Default.html, I thought IE9 supports indexOf in array but the following breaks. Any idea why?

Answer 1

your code looks right and this compatibility table shows that IE9 should support indexOf() and checks your actual browser for compatibility.

try to open it and take a look at your result. maybe you're running you IE in compatibility mode for IE7/8 or something else.

this jsfiddle works in my IE9 - please try that, too.