demo:        .eq {             color:#f00;/*标准浏览器*/             color:#f30\0;/*IE8,IE9,opera*/             *color:#c00;/*IE7及IE6*/             _color:#600;/*IE6专属*/            }        :root .eq {color:#a00\9;}/*IE9专属*/        @media all and (-webkit-min-device-pixel-ratio:10000), not all and (-webkit-min-device-pixel-ratio:0){.eq {color:#450;}}/*opera专属*/        @media screen and (-webkit-min-device-pixel-ratio:0){.eq {color:#879;}}/*webkit专属*/        @-moz-document url-prefix(){ .eq {color:#4dd;}}/*firefox专属*/