lf-start", top_left);
  test_position_area(writing_direction, "x-start y-start", top_right);
  test_position_area(writing_direction, "x-self-start y-self-start", top_left);
  test_position_area(writing_direction, "inline-start block-end", bottom_right);
  test_position_area(writing_direction, "self-inline-start self-block-end", bottom_left);

  // containing-block: vertical-lr / ltr
  // self: horizontal-tb / ltr
  writing_direction = "containing-block: vertical-lr / ltr";
  container.style.writingMode = "v