quals(getBox("den0004c").top - getBox("num0004c").bottom,
                           v, epsilon, "mfrac: gap");
    }, "DisplayStyleGapMin Dsiplaystyle on fraction");

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

      var v = 8000 * emToPx;
      assert_approx_equals(getBox("den0005").top - getBox("num0005").bottom,
                           v, epsilon, "mfrac: gap");
    }, "GapMin");

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

      v