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<!DOCTYPE html> <html> <head> <style> input:read-only { background-color: yellow; } </style> </head> <body> <h3>:read-only 选择器的演示。</h3> <p>一个普通的输入元素：<br><input value="hello"></p> <p>只读输入元素：<br><input readonly value="hello"></p> <p>:read-only 选择器选择具有“readonly”属性的表单元素。</p> </body> </html>