_left);

  // Writing-mode and direction on self
  container.style.writingMode = "horizontal-tb";
  container.style.direction = "ltr";

  // containing-block: horizontal-tb / ltr
  // self: horizontal-tb / rtl
  writing_direction = "self: horizontal-tb / rtl";
  anchored.style.writingMode = "horizontal-tb";
  anchored.style.direction = "rtl";
  test_position_area(writing_direction, "start start", top_left);
  test_position_area(writing_direction, "self-start self-start", top_right);
  test_position_area(wri