es focus to the next radio button in the radio group.
              If focus is on the last radio button in the radio group, moves focus to the first radio button in the group.
            </li>
            <li>
              <kbd>Up Arrow</kbd> (optional): Moves focus to the previous radio button in the radio group.
              If focus is on the first radio button in the radio group, moves focus to the last radio button in the group.
            </li>
          </ul>
          <div class="note">
       