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<!DOCTYPE html>
<html>
<head>
<style>
html, body {
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<div style="overflow: auto; width: 150px; height: 200px">
<div style="position: sticky; top: 0; width: 100px; height: 100px; background-color: green"></div>
<div style="height: 300px; width: 100px"></div>
</div>
</body>
</html>