CSS3 Transform Rotate

-moz-transform: rotate(45deg);  /* FF3.5+ /

-o-transform: rotate(45deg);  / Opera 10.5 /

-webkit-transform: rotate(45deg);  / Saf3.1+, Chrome /

-ms-transform: rotate(45deg);  / IE9 /

transform: rotate(45deg);

filter: progid:DXImageTransform.Microsoft.Matrix(M11=0.9914448613738104, M12=-0.97052619222005159,M21=0.43052619222005157, M22=0.8914448613738104, sizingMethod='auto expand');/ IE6–IE8 */

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When using a stack similar to the one above. The ugly Microsoft filter will actually cause problems in ie9. What once was a hack to rotate in old ie browsers, will not render properly in ie9.

Solution: As a best practice ie hacks should be in ie specific stylesheets, the Microsoft filter should only be included for ie8 and earlier.