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chromium/third_party/blink/web_tests/fast/forms/fieldset/overflow-scroll-interaction.html 

<!DOCTYPE html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script src="../../../resources/testdriver.js"></script>
<script src="../../../resources/testdriver-vendor.js"></script>
<script src="../../../resources/gesture-util.js"></script>
<style>
fieldset {
  height: 200px;
  overflow: scroll;
  padding: 0;
}

.content {
  height: 400px;
}
</style>

<fieldset id="fs1">
  <legend>Legend</legend>
  <div class="content"></div>
</fieldset>

<fieldset id="fs2">
  <legend>Legend</legend>
  <div class="content"></div>
</fieldset>

<script>
function eventPromise(target, type) {
  return new Promise((resolve, reject) => {
    target.addEventListener(type, resolve);
  });
}

promise_test(async () => {
  const fieldset = document.querySelector('#fs1');
  assert_equals(fieldset.scrollHeight, 400);
  await test_driver.click(fieldset);
  assert_equals(fieldset.scrollTop, 0);
  await test_driver.send_keys(fieldset, ' ');
  await eventPromise(fieldset, 'scroll');
  assert_greater_than(fieldset.scrollTop, 0);
}, 'Pressing the space bar should scroll up');

promise_test(async () => {
  const fieldset = document.querySelector('#fs2');
  assert_equals(fieldset.scrollHeight, 400);
  assert_equals(fieldset.scrollTop, 0);
  await wheelTick(0, 10, elementCenter(fieldset));
  assert_greater_than(fieldset.scrollTop, 0);
}, 'Wheel scroll should work');
</script>