<!DOCTYPE html>
<html lang="en">
<head>
<style>
*{
margin: 0;
}
span::before{
content: "今天是";
/*还可以*/
/*position: relative;
left: 50px;
top: 50px;
display: inline-block;
width: 20px;
height: 20px;
background-color: red;*/
}
span::after{
content: "不用上课"
}
</style>
<meta charset="UTF-8">
<title>伪元素</title>
</head>
<body>
<span>星期六</span>
</body>
</html>
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