<html><head><style>a:hover{background-color:yellow;}</style></head><body><a href="http://www.gxlcms.com/">W3Sschool</a><a href="http://www.google.com/">Google</a><a href="http://www.wikipedia.org/">Wikipedia</a><p><b>注释：</b>:hover 选择器鼠标指针在其上浮动的链接设置样式。</p></body></html>