复制代码代码如下: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>overflow属性用法</title> <style type="text/css"> div#sidebar { background-color:blue; }#sidebar div{ background-color:red; } </style> </head> <body> <div> <div id="sidebar">我是蓝色 <div>我是红色</div> </div> </div></div></body> </html>