html 两个div并列显示

<!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> 

<style type="text/css">

.div1
{
float:left;
width:175px;
height:20px;
}
.div2
{
width:175px;
height:20px;
float:left;
}
div3
{
width:250px;
height:50px;
clear:both;
}
</style>
</head> 

<body> 

<div class="div1"> div1111</div>
<div class="div2"> div2222</div>


</body> 
</html> 

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