content可用于在链接后的括号内加上网址:
<!DOCTYPE html>
<html>
<head>
<style>
a:after {content: " (" attr(href) ")";}
</style>
</head>
<body>
<p><a href="https://www.cnblogs.com/qq2806933146xiaobai">小白工作室</a></p>
</body>
</html>
<html>
<head>
<style>
a:after {content: " (" attr(href) ")";}
</style>
</head>
<body>
<p><a href="https://www.cnblogs.com/qq2806933146xiaobai">小白工作室</a></p>
</body>
</html>