        element.classList.add(scope);
          }
        }
      }
    }

    function transformHost(host, scope) {
    }

    // Given a string of cssText and a scoping string (scope), returns
    // a string of scoped css where each selector is transformed to include
    // a class created from the scope. ShadowDOM selectors are also transformed
    // (e.g. :host) to use the scoping selector.
    function transformCss(rules, scope, ext, callback, useAttr) {
      var hostScope = calcHostSc