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<html>
<head>
<title>test</title>
<style>
div {
width: 1000px;
height: 100px;
background-color: #f00;
}
@media screen and (min-width: 1px) {
div {
width: 200px;
}
}
</style>
</head>
<body>
<div></div>
</body>
</html>