<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>导航代码position：relative</title> <style type="text/css"> .a1{ width:120px; height:40px; background-color:#F00; position:relative; cursor:pointer; overflow:hidden;} .a1:hover{ overflow:visible} .a2{ width:120px; height:40px; background-color:#00F; position:relative; cursor:pointer; top:40px; overflow:hidden;} .a2:hover{ overflow:visible } .a3{ width:120px; height:40px; background-color:#0F0; margin-left:120px; cursor:pointer;} .a4{ width:120px; height:40px; background-color:#FF0; position:relative; cursor:pointer; top:40px; overflow:hidden;} .a4:hover{ overflow:visible } .a5{ width:120px; height:40px; background-color:#F90; margin-left:120px; cursor:pointer;} .a6{ width:120px; height:40px; background-color:#63F; position:relative; cursor:pointer; top:40px; overflow:hidden;} .a6:hover{ overflow:visible} .a7{ width:120px; height:40px; background-color:#999; margin-left:120px; cursor:pointer;} </style> </head> <body> <div class="a1"> <div class="a2"><div class="a3"></div> </div> <div class="a4"><div class="a5"></div> </div> <div class="a6"><div class="a7"></div> </div> </div> </body> </html>