<!doctype HTML>
<div id=target style="width: 200px; height: 200px; overflow-y: scroll; border-radius: 5px">
<div style="width: 100px; height: 100px; background: lightblue; will-change: transform;"></div>
<div style="width: 100px; height: 300px;"></div>
</div>
<script>
if (window.testRunner)
window.testRunner.waitUntilDone();
onload = function() {
requestAnimationFrame(() =>
requestAnimationFrame(() => {
target.scrollBy(0, 50);
if (window.testRunner)
window.testRunner.notifyDone();
}));
}
</script>