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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>无标题文档</title> </head> <body> <style type="text/css"> <!-- div { position:absolute; top:50%; left:50%; margin:-100px 0 0 -100px; width:200px; height:200px; border:1px solid red; } --> </style> <div></div> </body> </html>
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