IE9的css hack

select {
background-color:red\0;  /* ie 8/9*/
background-color:blue\9\0;  /* ie 9*/
*background-color:#dddd00;  /* ie 7*/
_background-color:#CDCDCD;  /* ie 6*/
}

#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 */