<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="UTF-8"/>
<title></title>
<meta name="viewport" content="width=device-width, initial-scale=1 user-scalable=no"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<meta name="renderer" content="webkit"/>
<style>
.float {
float: left;
height: 100px;
background: rebeccapurple;
}
.box {
clear: both;
background: green;
height: 100px;
margin-top: 10px;
}
</style>
</head>
<body>
<div class="float"></div>
<div class="box"></div>
</body>
</html> increase the value of margin-top when the box element is set to clear:both, or decrease the value of margin-top
the box element does not move
when the box element does not set clear:both, it increases the value of its margin-top, or decreases the value of margin-top
the box element and the float element move together