<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>浮动</title>
<style type="text/css">
div{margin: 5px;
padding: 5px;
border: 1px solid red;}
.a,.b{width: 215px;
height: 120px;
}
.box1{
float: left;
}
.box2{float: right;}
</style>
</head>
<body>
<div class="a">
<div class="box1">box1</div>
<div class="box2">box2</div>
</div>
<div class="b">
<div class="box1">box3</div>
<div class="box2">box4</div>
</div>
</body>
</html>
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