<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>test</title>
<style type="text/css">
.box{
width: 1000px;
position: relative;
}
.f_cba:after{
content: "";
display: block;
clear: both;
}
.f_fr{
height: 200px;
width: 200px;
float: right;
background-color: red;
}
.lbox{
position: absolute;
top:0;left: 0;
width: 200px;
height: 100%;
background-color: skyblue;
}
</style>
</head>
<body>
<div class="box f_cba">
<div class="f_fr">
</div>
<div class="lbox">
</div>
</div>
</body>
</html>
原文来自：前端div不设高度，由内容撑开，继承兄弟元素的高度案例-蒲公英云 (dandelioncloud.cn)
标签：撑开,高度,width,div,不设,200px From： https://www.cnblogs.com/angel648/p/17023159.html