gecko-dev/layout/reftests/async-scrolling/fixed-pos-scrolled-clip-4-r...

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HTML

<!DOCTYPE html>
<html>
<title>Reference for: This is fixed-pos-scrolled-clip-1.html in an iframe</title>
<style>
body {
margin: 0;
height: 4000px;
}
.subframe {
position: relative;
left: 10px;
top: 10px;
width: 500px;
height: 600px;
overflow: auto;
box-shadow: 0 0 0 2px black;
}
.scrolled {
height: 4000px;
}
.greenSquare {
position: absolute;
top: 300px;
left: 100px;
width: 200px;
height: 200px;
background: lime;
}
</style>
<div class="subframe">
<div class="scrolled">
<div class="greenSquare"></div>
</div>
</div>
<script>
document.documentElement.scrollTop = 20;
document.querySelector('.subframe').scrollTop = 200;
</script>