clamp-scroll-offset-if-size-changes-during-animation.html

<!DOCTYPE html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script src="../../../resources/gesture-util.js"></script>

<div id="scroller" style="width: 400px; height: 400px; overflow: scroll">
  <div id="space" style="width: 400px; height: 2000px"></div>
</div>

<script>
var scroller = document.getElementById("scroller");

promise_test (async () => {
  const scrollendPromise = waitForScrollendEvent(scroller);
  scroller.scrollTo({top: 1500, behavior: 'smooth'});
  scroller.style.height = "1000px";
  await scrollendPromise;
  var expected = scroller.scrollHeight - scroller.clientHeight;
  assert_equals(scroller.scrollTop, expected);
}, "Clamps the scroll offset if the scroller's size is changed during animation.");

</script>

chromium/third_party/blink/web_tests/fast/scroll-behavior/smooth-scroll/clamp-scroll-offset-if-size-changes-during-animation.html