docs: function (selector, expected, hash) {
      this.actionQueue.push(this.webdriverClient.element.bind(this.webdriverClient, selector));
      this.actionQueue.push(this.webdriverClient.enabled.bind(this.webdriverClient));
      this.actionQueue.push(this._enabledCb.bind(this, selector, hash, expected));
      return this;
    }