<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>固定定位</title>
<style>
body{height:1000px;margin:0;}
.box{width:100px;height:100px;background:Red; position:fixed;left:50px;top:100px;}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>固定定位</title>
<style>
body{height:1000px;margin:0;}
.box{width:100px;height:100px;background:Red; position:fixed;left:50px;top:100px;}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>
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