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Test Info:

<!doctype html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>Overflow areas are updated when dynamically changed to overflow: clip</title>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="match" href="clip-001-ref.html">
<style>
#target {
width: 100px;
height: 100px;
overflow: visible;
}
#container {
overflow: auto;
height: 300px;
}
#fill {
height: 5000px;
background: blue;
}
</style>
<div id="container">
<div id="target">
<div id="fill"></div>
</div>
</div>
<script>
onload = function() {
let target = document.getElementById("target");
window.unused = target.getBoundingClientRect(); // Update layout
requestAnimationFrame(() => requestAnimationFrame(() => {
target.style.overflow = "clip";
document.documentElement.removeAttribute("class");
}));
}
</script>