5;
      var v2 = 1000 * emToPx;
      var radicalHeight = getBox("base001").height + v2;
      assert_approx_equals(getBox("ref001").top - getBox("index001").bottom,
                           v1 * radicalHeight / 100, epsilon,
                           "mroot: vertical position of index");
    }, "RadicalDegreeBottomRaisePercent");

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

      var v1 = 7000 * emToPx;
      var v2 = 1000 * emToPx;
      assert_approx_equals(getBox("