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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <style> p:after { content:"- Remember this"; background-color:yellow; color:red; font-weight:bold; } </style> </head> <body> <p>My name is Donald</p> <p>I live in Ducksburg</p> <p><b>注意:</b>:after作用于IE8 以及更早版本的浏览器,DOCTYPE 必须已经声明.</p> </body> </html>