<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> <style> p:before { content:"Read this -"; } </style> </head> <body> <p>My name is Donald</p> <p>I live in Ducksburg</p> <p><b>注意:</b> :before 作用于 IE8,DOCTYPE 必须已经声明.</p> </body> </html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> <style> p:after { content:"- 注意我 我是最帅的"; } </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>
