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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>无标题文档</title> 6 </head> 7 8 <body> 9 10 <div class="bbb"><div class="aaa"></div></div> 11 12 <style> 13 14 .aaa 15 { 16 width:100px; 17 height:50px; 18 background-color:#F00; 19 position:relative; 20 left:300px; 21 22 } 23 24 .bbb 25 { 26 width:500px; 27 height:300px; 28 background-color:#0F0; 29 position:absolute; 30 } 31 32 </style> 33 </body> 34 </html>
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原文地址：http://www.cnblogs.com/sihuiming/p/5269212.html
