代碼
提交代碼
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.demo:after{
content: '很好';
}
</style>
</head>
<body>
<div class="demo">慕課網(wǎng)</div>
</body>
</html>
運(yùn)行結(jié)果