伪元素练习（ css动态设置文本内容）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>伪元素练习</title>
<style>
.box{
width:200px;
height:200px;
background-color:grey;
float: left;
margin-left:50px;
margin-top: 50px;
text-align: center;
}
/* 在a元素内容之前 */
.a::before{
content:attr(data-info);
/* width:50px;
height:20px; */
padding:2px 10px;
line-height: 20px;
text-align: center;
background-color: hotpink;
color:white;
font-size:12px;
}
/*
css动态设置文本内容
1：将文本内容作为信息插入到结构元素身上
属性名=属性值 统一属性名 data-*
data-info
data-star
data-u
2:取信息 attr(data-*)
*/
</style>
</head>
<body>
<div class="box a" data-inf="享八折"></div>
<div class="box a" data-inf="减500元"></div>
<div class="box"></div>
</body>
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