docs: function (cfg, context, lineNumber) {
          this.$BindableWidget.constructor.apply(this, arguments);
  
          this._cfgOk = ariaCoreJsonValidator.validateCfg(this.WIDGET_CFG, cfg);
  
          if (!this._cfgOk) {
              return;
          }
  
          this._registerBindings();
  
          /**
           * Id generated for the button DOM element of the slider.
           * @type String
           * @protected
           */
          this._domId = cfg.id ? context.$getId(cfg.id) : this._createDynamicId();
  
      }