在其他标签上，使用BFC可以清除浮动，为什么body不可用。
果然，在body上添加overflow:hidden，形成BFC，可以达到清除浮动的效果，但是事实并非如此？
div.f {
float: left;
width: 100px;
height: 100px;
background: red;
margin-right: 1px;
}
body {
overflow: hidden;
border: 1px dashed skyblue;
}
.p {
overflow: hidden;
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<!-- <div class="p">
<div class="f"></div>
<div class="f"></div>
</div> -->
<div class="f"></div>
<div class="f"></div>
</body>
</html>
因为溢出在应用于 body 元素时具有特殊行为，并且它会传播到 html 元素。你需要添加overflow:auto到 html 以避免这种情况：
div.f {
float: left;
width: 100px;
height: 100px;
background: red;
margin-right: 1px;
}
body {
overflow: hidden;
border: 1px dashed skyblue;
}
html {
overflow: auto;
}
<div class="f"></div>
<div class="f"></div>
UAs must apply the overflow-* values set on the root element to the viewport. However, when the root element is an [HTML] html element (including XML syntax for HTML) whose overflow value is visible (in both axes), and that element has a body element as a child, user agents must instead apply the overflow-* values of the first such child element to the viewport. The element from which the value is propagated must then have a used overflow value of visible. ref https://drafts.csswg.org/css-overflow-3/#overflow-propagation
这样你的身体元素就会再次拥有overflow:visible传播后
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