为什么这样会塌陷，p标签没有形成BFC 一定要套个div？
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
p {
width: 200px;
height: 200px;
background-color: orange;
margin: 50px;
overflow: hidden;
}
.s1 {
float: left;
width: 300px;
height: 300px;
background-color: red;
}
.s2 {
overflow: hidden;
width: 200px;
height: 200px;
background-color: blue;
}
</style>
</head>
<body>
<p></p>
<p></p>
<section class="s1"></section>
<section class="s2"></section>
</body>
</html>
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