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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<style>
#container {
columns: 1;
width: 500px;
overflow: auto;
scroll-marker-group: after;
}
#container::scroll-marker-group {
display: block;
}
#container::column::scroll-marker {
content: ' ';
}
</style>
<div id="container"></div>
<script>
document.body.offsetTop;
requestAnimationFrame(() => {
requestAnimationFrame(() => {
container.style.width = "501px";
document.documentElement.classList.remove("reftest-wait");
});
});
</script>
</html>