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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>Document</title>
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+ <link rel="stylesheet" media="screen and (max-width: 600px)" href="./css/a.css">
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+ <link rel="stylesheet" media="screen and (max-width: 900px) and (min-width: 800px)" href="./css/b.css">
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+ <style>
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+ .box{
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+ width: 200px;
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+ height: 200px;
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+ background-color: red;
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+ }
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+ @media screen and (max-width:500px) {
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+ .box{
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+ background-color: blue;
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+ }
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+ }
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+ @media screen and (max-width:600px) and (min-width:500px) {
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+ .box{
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+ background-color: yellow;
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+ }
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+ }
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+
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+ /* 竖屏 */
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+ @media (orientation:portrait){
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+ .box{
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+ font-size: 50px;
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+ color: aqua;
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+ }
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+ }
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+ /* 横屏 */
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+ @media (orientation:landscape){
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+ .box{
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+ font-size: 60px;
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+ color: blueviolet;
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+ }
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+ }
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+ </style>
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+</head>
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+<body>
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+ <a href="https://www.runoob.com/cssref/css3-pr-mediaquery.html">文档</a>
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+ <div class="box">hello</div>
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+</body>
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+</html>
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