erdown_event = pointerdown_events.get(event.pointerId);
                    if (pointerdown_event) {
                        test_pointerEvent.step(function () {
                            assert_equals(event.pointerId, pointerdown_event.pointerId, "pointermove.pointerId should be the same as pointerdown.pointerId.");
                            assert_equals(event.isPrimary, pointerdown_event.isPrimary, "pointermove.isPrimary should be the same as pointerdown.isPrimary.");
                        });
    