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<!DOCTYPE html>
<html>
<head>
<style>
#container {
float: left;
position: sticky;
top: 0;
margin-top: -20px;
z-index: 100;
}
#target {
margin-top: 80px;
width: 20px;
height: 20px;
background: green;
}
#necessary-fixed-box {
position: fixed;
top: 0;
width: 20px;
height: 20px;
}
</style>
</head>
<body style="height: 10000px;">
<div id="container">
<div id="target"></div>
<div id="necessary-fixed-box"></div>
</div>
</body>
</html>
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