ie 9 渐变背景色兼容问题

/*窗口背景*/

.window {

background-color: #fff;

background: -webkit-linear-gradient(top,#EFF5FF 0,#fff 20%);

background: -moz-linear-gradient(top,#EFF5FF 0,#fff 20%);

background: -o-linear-gradient(top,#EFF5FF 0,#fff 20%);

background: linear-gradient(to bottom,#EFF5FF 0,#fff 20%);

background-repeat: repeat-x;

filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#fFF,endColorstr=#fFF,GradientType=0);

}

/*兼容IE9*/

:root .window {filter:none;}