use-counters.html | Explore in Territory

<!DOCTYPE html>
<title>Selection UseCounters</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
test(function() {
  var SelectionCollapseNull = 1083; // From UseCounter.h
  assert_false(internals.isUseCounted(document, SelectionCollapseNull));
  document.getSelection().collapse(null, -1);
  assert_true(internals.isUseCounted(document, SelectionCollapseNull));
}, 'selection.collapse(null, -1)');

test(function() {
  var SelectionSetBaseAndExtentNull = 1084; // From UseCounter.h
  assert_false(internals.isUseCounted(document, SelectionSetBaseAndExtentNull));
  document.getSelection().setBaseAndExtent(null, 0, null, 0)
  assert_true(internals.isUseCounted(document, SelectionSetBaseAndExtentNull));
}, 'selection.setBaseAndExtent(null, 0, null, 0)');
</script>

chromium/third_party/blink/web_tests/editing/selection/use-counters.html