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<!DOCTYPE html>
<html>
<title>Reference for: position:fixed should not be clipped by the subframe clip, but it should be clipped by the "clip" clip, and the "clip" clip should be moved by the subframe.</title>
<style>
body {
margin: 0;
height: 4000px;
}
.subframe {
margin-top: 300px;
width: 400px;
height: 400px;
overflow: auto;
}
.subframeScrolled {
height: 800px;
}
.greenSquare {
position: absolute;
top: 150px;
left: 100px;
width: 200px;
height: 200px;
background: lime;
}
</style>
<div class="subframe">
<div class="subframeScrolled"></div>
</div>
<div class="greenSquare"></div>
<script>
document.documentElement.scrollTop = 50;
document.querySelector('.subframe').scrollTop = 150;
</script>