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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <style> body { background-color: pink; } @media screen and (min-width: 480px) { body { background-color: lightgreen; } } </style> </head> <body> <h1>重置浏览器窗口查看效果!</h1> <p>如果媒体类型屏幕的可视窗口宽度小于 480 px ,背景颜色将改变。</p> </body> </html>