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<!DOCTYPE html>
<style>
body {
margin: 0;
height: 2000px;
}
div {
width: 100px;
height: 100px;
}
#anchor {
position: fixed;
left: 300px;
top: 300px;
background: orange;
}
#anchored {
position: fixed;
left: 400px;
top: 300px;
background: green;
}
</style>
<div id="anchor"></div>
<div id="anchored"></div>
<script>
document.documentElement.scrollTop = 200;
</script>