04").bottom,
                           v, epsilon, "mfrac: gap");
    }, "DisplayStyleGapMin");

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

      var v = 4000 * emToPx;
      assert_approx_equals(getBox("den0004b").top - getBox("num0004b").bottom,
                           v, epsilon, "mfrac: gap");
    }, "DisplayStyleGapMin Dsiplaystyle");

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

      var v = 4000 * emToPx;
      assert_approx_e