           var el = alert.$$('.alert');
              var h3Title = alert.$$('.alert h3').textContent;
              assert.equal(h3Title, 'Title');
              assert.include(
                el.classList.value,
                'success',
                "Classlist contains 'success'"
              );
              assert.equal(
                getComputedStyle(el).display,
                'none',
                'Alert not visible'
              );
              assert.equal(getComputedStyle(el).opacity