ument.getElementById("mrow-padding").
              getBoundingClientRect();
          assert_approx_equals(b.width, 20 + 50 + 30, epsilon, "element width");
          assert_approx_equals(b.height, 40 + 50 + 50, epsilon, "element height");
      }, "Padding properties on mrow");

      test(function() {
          assert_true(MathMLFeatureDetection.has_mspace());
          assert_true(MathMLFeatureDetection.has_dir());
          var s = measureSpaceAround("mrow-padding-rtl")
          assert_approx_equals(s