CSS3/CSS2 @media 语法
2 @media 语法说明:本文档兼容性测试基础环境为:windows系统;IE6-IE10, Firefox6.0, Chrome13.0, Safari5.1, Opera11.51语法:@media:<media_query_list><media_query_list>:[<media_query>[',' <media_query>]*]?<media_query>:[only | not]? <media_type> [and <expression>]* | <expression> [and <expression>]*<expression>:'('<media_featu