IE 支持boxshadow

ie%20box-shadow.css

filter:progid: DXImageTransform.Microsoft.Shadow(color=#ffffff,direction=0,strength=0) progid: DXImageTransform.Microsoft.Shadow(color=#aaaaaa,direction=90,strength=5) progid: DXImageTransform.Microsoft.Shadow(color=#aaaaaa,direction=180,strength=8) progid: DXImageTransform.Microsoft.Shadow(color=#cccccc,direction=270,strength=5)

ie%2520box-shadow.css

/*
	@ 名称: 投影 | drop shadow
	@ 用法: 添加 .sl-shadow
	*/
	.sl-shadow{

	/* modern web browsers */
	-moz-box-shadow:1px 3px 12px #bbb;
	-webkit-box-shadow:1px 3px 12px #bbb;
	box-shadow:1px 3px 12px #bbb;

	/* 一定要设置background, 不然 ie 会显示在字体上 */
	background: #fff;

	/* gte=ie8 */
	-ms-filter:"progid:DXImageTransform.Microsoft.Glow(color=#aaaaaa,strength=3) progid:DXImageTransform.Microsoft.Shadow(color=#eeeeee,direction=0,strength=6) progid:DXImageTransform.Microsoft.Shadow(color=#dddddd,direction=90,strength=10) progid:DXImageTransform.Microsoft.Shadow(color=#dddddd,direction=180,strength=6) progid:DXImageTransform.Microsoft.Shadow(color=#eeeeee,direction=270,strength=6)";
		
	/* lte=ie7 */
	*filter:
    progid:DXImageTransform.Microsoft.Shadow(color=#eeeeee,direction=0,strength=7)
    progid:DXImageTransform.Microsoft.Shadow(color=#dddddd,direction=90,strength=10)
    progid:DXImageTransform.Microsoft.Shadow(color=#dddddd,direction=180,strength=10)
    progid:DXImageTransform.Microsoft.Shadow(color=#eeeeee,direction=270,strength=7);
}
/* IE 9 干掉filter */
.sl-shadow:not(s){filter:none;}