IE下iframe height="100%"无效的解决方法

IE7下iframe height="100%"无效的解决方法就是css如下写法：

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">   
 2 <html xmlns="http://www.w3.org/1999/xhtml">   
 3 <head>   
 4     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />   
 5     <title>iframe 100% Height</title>   
 6     <style type="text/css">   
 7          *{ margin:0; padding:0; border:0;}   
 8          html,body{ height:100%; position:relative;}   
 9          iframe{ height:100%; width:100%; overflow:auto; position:absolute; top:0; left:0;}   
10     </style>   
11 </head>   
12  
13 <body>   
14     <iframe src="http://www.google.com.hk"></iframe>   
15 </body>   
16 </html>