s) {
          for (let iprop in options.instanceProps) {
            if (iprop in props) {
              this._setPendingProperty(iprop, props[iprop]);
            }
          }
        }
        for (let hprop in this.__hostProps) {
          this._setPendingProperty(hprop, this.__dataHost['_host_' + hprop]);
        }
      }
      /**
       * Forwards a host property to this instance.  This method should be
       * called on instances from the `options.forwardHostProp` callback
       * to propagate c