sert_equals(getComputedStyle(subject1).color, "rgb(0, 128, 0)",
                  "subject1 should be green");
    assert_equals(getComputedStyle(subject3).color, "rgb(0, 100, 0)",
                  "subject3 should be darkgreen");

    await test_driver.send_keys(document.body, tab_key);
    assert_equals(getComputedStyle(subject1).color, "rgb(154, 205, 50)",
                  "subject1 should be yellowgreen");
    assert_equals(getComputedStyle(subject3).color, "rgb(173, 255, 47)",
                  "subj