#test  

    {  

        width:300px;  

        height:300px;  

        color:red !important;/* Firefox、IE7支持 */

        background-color:blue;      /*firefox*/

        background-color:red\9;      /*all ie*/

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

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

        _background-color:orange;       /*ie6*/

    } 

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

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

    @media screen and (-webkit-min-device-pixel-ratio:0){ #test {background-color:gray;} }  /*chrome and safari*/

 body:nth-of-type(1) p{color:red;} /* Chrome、Safari支持 */