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<!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>Div Middle</title> <style> span{width:100px;height:100px;background:red;float:left} </style> </head> <body> <span></span> </body> </html>
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原文地址：http://www.cnblogs.com/hduhdc/p/5493096.html
