三列布局这段代码有错吗?
<!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>三列布局</title>
<style type="text/css">
body{margin:0;padding:0;}
.left{width=33.33%;height=600px;background:#F93;float:left;}
.middle{width:33.33%;height=600px;background:#0F9;float:left;}
.right{width:33.33%;height=600px;background:#936:float:right;}
</style>
</head>
<body>
<div class="left"></div>
<div class="middle"></div>
<div class="right"></div>
</body>
</html>
请问下这段代码有错嘛?为什么显示不出效果