摘要： /* Opera */html:first-child #opera{display: block;}/* IE 7 */html > body #ie7{*display: block;}/* IE 6 */body #ie6{_display: block;}/* Firefox 1 - 2 */body:empty #firefox12{display: block;}/* Firefox */@-moz-document url-prefix(){#firefox { display: block; }}/* Safari */@media screen and (-webkit 阅读全文