ocument.getElementById('checkbox1'),
            checkbox2 = document.getElementById('checkbox2');

        label.click();
        assert_false(checkbox1.checked, "checkbox should not be checked");
        assert_true(checkbox2.checked, "checkbox should be checked");
        label.click();
        assert_false(checkbox1.checked, "checkbox should not be checked");
        assert_false(checkbox2.checked, "checkbox should not be checked");
    }, "Verify non-nested label 'for' logic");

    async_test(function