<!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=gb2312" /> <title>CSS等高布局</title> <style type="text/css"> *{ margin:0; padding:0; } #wrap{ width:1000px; margin:0 auto; overflow:hidden; zoom:1;/* for ie6 */ } #left,#center,#right{ margin-bottom:-10000px; padding-bottom:10000px; } #left{ float:left; width:250px; background:#00FFFF; } #center{ float:left; width:500px; background:#FF0000; } #right{ float:right; width:250px; background:#00FF00; } </style> </head> <body> <div id="wrap"> <div id="left"> <p>left</p> <p>left</p> <p>left</p> <p>left</p> <p>left</p> </div> <div id="center"> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> <p>center</p> </div> <div id="right"> <p>right</p> <p>right</p> <p>right</p> </div> </div> </body> </html> Child div: margin-bottom:-1000px; padding-bottom:1000px;
Parent div: overflow:hidden; zoom:1 ;
The child div padding-bottom:1000px; pushes its own box down to become taller; margin-bottom:-1000px; allows the parent div to shrink upward to the height of the content entity, including the height of the content entity. The tallest child div blocks the shrinkage of the parent div, so it looks like the three divs have the same height. In fact, the height of the blank space is padding, which can be used to lay out content, because negative margins are set
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