IE9 is apparently able to handle rounded corners by using the CSS3 standard definition of border-radius
.
What about support for border radius and>
I decided to disable IE9 from rounding corners to workaround this bug. It's clean, easy and generic usable.
{
border-radius:10px;
border-radius:0px \0/;
background:linear-gradient(top , #ffeecc, #ff8800);
/* ... (-moz -ms,-o, -webkit) gradients */
filter: progid:DXImageTransform.Microsoft.gradient(GradientType=0,startColorstr=#ffeecc,endColorstr=#ff8800);
}