docs: function (cfg, ctxt) {
          this.$Widget.constructor.apply(this, arguments);
  
          this._cssClassNames = ariaCoreTplClassLoader.addPrintOptions(this._cssClassNames, cfg.printOptions);
  
          // might be set by subclasses
          this._frame = null;
  
          /**
           * Specifies if size constraints are specified in the config (and so if it is useful to call
           * aria.utils.Size.setContrains for this container).
           * @type Boolean
           * @protected
           */
          this._sizeConstraints = (!!cfg.minWidth || !!cfg.maxWidth || !!cfg.minHeight || !!cfg.maxHeight);
  
          // if size contrains -> adjust size after init. Do not set directInit to false if already to true.
          this._directInit = this._directInit || this._sizeConstraints;
      }