A CodePen by AJ. 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  */}
:root #element { color:pink \0/IE9; }  /* IE9 */