<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>WebBuilder</title> <style type="text/css"> #left{ height: 300px; width: 120px; float: left; background-color: #f99; } #right{ height: 300px; width: 120px; float: right; background-color: #FF9999; } #main{ height: 300px; margin: 0 120px; background-color: #cc3; } </style> </head> <body> <div id="left">zuo</div> <div id="right">you</div> <div id="main">zhong</div> </body></html>在div標(biāo)簽中如果把id=“right”換成main ?main換成right為什么所顯示的界面與原來的就不同了！
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