網頁效果
css代碼：
.div1{
width: auto;
height: auto;
background-color: #ccc;
border: 1px solid red;
}
.clearfox{
display: inline-block;
_height: 1%;
}
.clearfox:after{
content: "ss";
clear: both;
display: block;
visibility: hidden;
font-size: 0;
height: 0;
}
.div2{
width: 200px;
height: 100px;
float: left;
background-color: aqua;
}
網頁前端
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>選擇器優先級問題</title>
<link rel="stylesheet" type="text/css" href="css/style.css"/>
</head>
<body>
<div class="div1 clearfox">
<div class="div2">
</div>
</div>
</body>
</html>