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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>CSS3 :only-of-type 选择器 实例 - 自学教程(runoops.com)</title> <style> p:only-of-type { background: #ff0000; } </style> </head> <body> <div> <p>This is a paragraph.</p> </div> <div> <p>This is a paragraph.</p> <p>This is a paragraph.</p> </div> </body> </html>
运行结果: