 // containing-block: vertical-lr / rtl
  // self: horizontal-tb / ltr
  writing_direction = "containing-block: vertical-lr / rtl";
  container.style.writingMode = "vertical-lr";
  container.style.direction = "rtl";
  test_position_area(writing_direction, "start start", bottom_left);
  test_position_area(writing_direction, "self-start self-start", top_left);
  test_position_area(writing_direction, "x-start y-start", bottom_left);
  test_position_area(writing_direction, "x-self-start y-self-start", top_left)