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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <style> p:after { content:"- 注意我"; } </style> </head> <body> <p>我的名字是 Donald</p> <p>我住在 Ducksburg</p> <p><b>注意:</b> :after在IE8中运行,必须声明 !DOCTYPE </p> </body> </html>