window.background:dir(ltr)
  box.horizontal:dir(ltr)
    box.horizontal:dir(ltr)
      label:dir(ltr)
        font-size: 20px; /* nth-child.css:2:3-19 */
      label:dir(ltr)
        font-size: 30px; /* nth-child.css:5:3-19 */
      label:dir(ltr)
        font-size: 40px; /* nth-child.css:8:3-19 */
    box.horizontal:dir(ltr)
      label:dir(ltr)
        font-size: 50px; /* nth-child.css:11:3-19 */