<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.div1{
height:100px;
background: green;
}
.div2{
height: 100px;
width: 100px;
float: left;
background-color: red;
}
</style>
</head>
<body>
<div>
<div>1</div>
<div>2</div>
</div>
</body>
</html>div2在div1下面
<body> <div> <div>1</div> <div>2</div> </div> </body>

div2在div1上面
<body> <div class="wrap"> <div class="div2">2</div> <div class="div1">1</div> </div> </body>

为什么body中,颠倒了div的顺序结果会不同?
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