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<!DOCTYPE html> <html> <head> <style> a::after { content: " (" attr(href) ")"; } </style> </head> <body> <h1>content 属性</h1> <p>content 属性用于插入生成的内容。</p> <p>看看我们的：</p> <p> <a href="https://www.begtut.com/css/">CSS 教程</a><br> <a href="https://www.begtut.com/cssref/">CSS 参考</a> </p> </body> </html>