checkBg(document.querySelector('div'));
        checkBg(document.querySelector('x-menu').shadowRoot);
        checkBg(document.querySelector('x-menu-group').shadowRoot.querySelector('x-group').shadowRoot);
      });
      test('dynamically updates', function() {
        makeElement('x-dynamic');
        makeElement('x-dynamic-container');
        var container = document.createElement('x-dynamic-container');
        document.body.appendChild(container);
        if (window.ShadyDOM) {
          ShadyDOM.flus