"msupBase").middle, getBox("baseline").bottom, e, "msup: base is placed on the baseline");
      assert_approx_equals(getBox("msubsupBase").middle, getBox("baseline").bottom, e, "msubsup: base is placed on the baseline");
    }, "Alignment of the base on the baseline");

    test(function() {
      assert_true(MathMLFeatureDetection.has_mspace());

      assert_greater_than(getBox("msubSub").middle, getBox("msubBase").middle, "msub: script is placed at the bottom of the base");
      assert_less_than(getBox