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<!DOCTYPE html>
<meta charset="utf-8">
<style>
#target {
width: 100px;
height: 100px;
background: green;
position: fixed;
top: 0;
left: 100px;
}
#spacer {
height: 200vh;
}
</style>
<div id="target">target</div>
<div id="spacer"></div>