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Test Info: Warnings

<!DOCTYPE html>
<title>Layout Instability: shift with counterscroll not counted</title>
<link rel="help" href="" />
#s {
overflow: scroll;
position: absolute;
left: 20px;
top: 20px;
width: 200px;
height: 200px;
#sp {
width: 170px;
height: 600px;
#ch {
position: relative;
background: yellow;
left: 10px;
top: 100px;
width: 150px;
height: 150px;
<div id="s">
<div id="sp">
<div id="ch"></div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/util.js"></script>
promise_test(async () => {
const watcher = new ScoreWatcher;
// Wait for the initial render to complete.
await waitForAnimationFrames(2);
let scroller = document.querySelector("#s");
let changer = document.querySelector("#ch"); = "200px";
scroller.scrollTop = 100;
await waitForAnimationFrames(3);
assert_equals(watcher.score, 0);
}, "Shift with counterscroll not counted.");