http://www.cnblogs.com/mofish/archive/2011/09/06/2168418.html
针对ie9的 css HACK
#element { color:orange; } #element { *color: white; /* IE6 + 7, doesn't work in IE8/9 as IE7 */ } #element { _color: red; /* IE6 */ } #element { color: green\0/IE8+9; /* IE8 + 9 + IE10pp4 */ } :root #element { color:pink \0/IE9; } /* IE9 + IE10pp4 */