Why dropdown menu doesn't work in IE9?

Question

I have a dropdown menu that works fine in all browsers except IE9 . This is my menu http://jsfiddle.net/7Xuxv/2/ but I have no idea why this doesnt'work!

If you have Internet Explorer 10 and you want to test in IE9 you have to hitting F12 on IE10 it should start the Developer Tools that allows you to emulate IE9 using the Browser Mode [read more] .

Any help is appreciated. Thank you so much.

Answer 1

you problem is:

z-index: 1 !important;

remove it in your css and it works.. yet to find why