eft);
  test_position_area(writing_direction, "x-self-start y-self-start", top_right);

  // containing-block: horizontal-tb / ltr
  // self: vertical-rl / rtl
  writing_direction = "self: vertical-rl / rtl";
  anchored.style.writingMode = "vertical-rl";
  anchored.style.direction = "rtl";
  test_position_area(writing_direction, "start start", top_left);
  test_position_area(writing_direction, "self-start self-start", bottom_right);
  test_position_area(writing_direction, "x-start y-start", top_left);
  tes