<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>伪元素选择器</title>
<style>
a {
display: block;
width: 200px;
height: 200px;
background-color: pink;
line-height: 200px;
text-align: center;
color:#fff;
text-decoration: none;
}
a:hover::after{
display: block;
width: 200px;
height: 200px;
background-color:deeppink;
content: "我是后面的伪元素选择器"; /* content一定要写 可以留空 content:'' */
}
a:hover::before{
display: block;
width: 200px;
height: 200px;
background-color:blue;
content: "我是前面的伪元素选择器"; /* content一定要写 可以留空 content:'' */
}
</style>
</head>
<body>
<a href=""></a>
</body>
</html>