多层在同一行
多个div层在同一行示例，关键属性见红色字体
?
<html xmlns="http://www.w3.org/1999/xhtml">
?? <head>
????? <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
?????? <title>三层一行排列</title>
?? </head>
?? <body>
????? <div style="clear:none; width:200px; height:300px; float:left; background:#FF0000;">A</div>
????? <div style="clear:none; width:200px; height:300px; float:left; background:#00FF00;">B</div>
????? <div style="clear:none; width:200px; height:300px; float:left; background:#0000FF;">C</div>
?? </body>
</html>
