css hack

#test

{

width:300px;

height:300px;

background-color:blue;/*firefox*/

background-color:red\9;/*allie*/

background-color:yellow\0;/*ie8*/

+background-color:pink;/*ie7*/

_background-color:orange;/*ie6*/

}

:root#test{background-color:purple\9;}/*ie9*/

@mediaalland(min-width:0px){#test{background-color:black\0;}}/*opera*/

@mediascreenand(-webkit-min-device-pixel-ratio:0){#test{background-color:gray;}}/*chromeandsafari*/

</style>