HTML+CSS代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>viewport窗口自适应</title>
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=0,shrink-to-fit=no,viewport-fit=cover">
<meta content="telephone-no,email=no" name="format-detection">
<style type="text/css">
body{
padding: 0;
margin: 0;
}
div{
max-width: 720px;
min-width: 320px;
margin: 0 auto;
width: 100%;
background-color: pink;
}
</style>
</head>
<body>
<div>
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</div>
</body>
</html>
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