select-element.html | Explore in Territory

<!doctype HTML>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<select id="target" size="2">
  <option> value 1</option>
  <option> value 2</option>
  <option> value 3</option>
  <option> value 4</option>
</select>
<script>
if (window.internals) {
  internals.settings.setPreferCompositingToLCDTextEnabled(true);
}
function assertLayers(expected_count) {
  var json = internals.layerTreeAsText(document);
  assert_equals(JSON.parse(json).layers.length, expected_count, json);
}
test(() => {
  assertLayers(2);
}, "scrollable");
test(() => {
  target.size = 4;
  assertLayers(1);
}, "not scrollable");
</script>

chromium/third_party/blink/web_tests/compositing/select-element.html