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<!DOCTYPE html> <html> <head> <style> input:out-of-range { border: 2px solid red; } </style> </head> <body> <h3>:out-of-range 选择器的演示。</h3> <input type="number" min="5" max="10" value="17"> <p>尝试在给定范围内（5 到 10 之间）键入一个数字，以查看样式消失。</p> </body> </html>