en touch dragging.');

  promise_test(async (t) => {
    await test_scrollend_on_scrollbar_gutter_click(t, target_div);
  }, 'Tests that the target_div gets scrollend event when clicking ' +
     'scrollbar.');

  // Same issue as previous test.
  promise_test(async (t) => {
    await test_scrollend_on_scrollbar_thumb_drag(t, target_div);
  }, 'Tests that the target_div gets scrollend event when dragging the ' +
      'scrollbar thumb.');

  promise_test(async (t) => {
    await test_scrollend_on_mousewheel