t with margin is constrained to viewport height (bottom, right)', function() {
          var el = fixture('sized-x');
          el.classList.add('positioned-bottom');
          el.classList.add('positioned-right');
          el.classList.add('with-margin')
          el.refit();
          var rect = el.getBoundingClientRect();
          assert.isTrue(rect.height <= window.innerHeight - 100 - 20 * 2, 'height is less than or equal to viewport height');
        });

        test('scrolling sizingTarget is const