overflow-scroll-root-frame-animates.html

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../../resources/gesture-util.js"></script>
<title>Tests that overflow scrolls on the root element are animated.</title>

<style>
#content {
  width: 750px;
  height: 10000px;
  background-color: blue;
}
</style>

<div id="content"></div>

<script>
if (!window.internals) {
  assert_unreached("This test must be run in the test harness");
}
internals.settings.setScrollAnimatorEnabled(true);

promise_test(async () => {
  await waitForCompositorCommit();
  await waitForScrollReset(document.scrollingElement);
  await Promise.all([
    animatedScrollPromise(document),
    keyboardScroll("End", document),
  ]);
  assert_true(
      window.scrollY >= document.body.scrollHeight - window.innerHeight);
}, "Tests that overflow scrolls on the root element are animated.");
</script>

chromium/third_party/blink/web_tests/fast/scroll-behavior/overflow-scroll-root-frame-animates.html