 assert_approx_equals(s.right, 30, epsilon, "right padding");
          assert_approx_equals(s.top, 40, epsilon, "top padding");
          assert_approx_equals(s.bottom, 50, epsilon, "bottom padding");
          var b = document.getElementById("mrow-padding-logical").
              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 (lo