-width: 580px){polyfill-next-selector{content:':host > article '}::content article{padding-top:70px}}

    </style>
    <article>article</article>
  </template>

  <script>
    XTest = register('x-test', '', HTMLElement.prototype, ['x-test']);
  </script>

  <x-test></x-test>

  <script>
    test('compressed', function() {
      var sheet = document.querySelector('[shim-shadowdom-css]');
      chai.assert.notMatch(sheet.textContent, /polyfill-next-selector/, 'polyfill rules properly replaced');
      chai.a