eft:0, top:225, width:100, height:175};
  const bottom_right = {left:250, top:225, width:150, height:175};

  anchored.style.writingMode = "horizontal-tb";
  anchored.style.direction = "ltr";

  // Writing-mode and direction on container
  let writing_direction = "containing-block: horizontal-tb / rtl";
  container.style.writingMode = "horizontal-tb";
  container.style.direction = "rtl";
  test_position_area(writing_direction, "start start", top_right);
  test_position_area(writing_direction, "self-start se