docs: function (selector, hash) {
      if (selector !== null) {
        this.actionQueue.push(this.webdriverClient.element.bind(this.webdriverClient, selector));
      }
      this.actionQueue.push(this.webdriverClient.frame.bind(this.webdriverClient));
      this.actionQueue.push(this._frameCb.bind(this, selector, hash));
      return this;
    }