docs: function (htmlElem, properties, cfg) {
                  var elem = this._getHTMLElement(htmlElem);
                  if (elem == null) {
                      this.$logWarn(this.INVALID_HTML_ELEMENT);
                      return null;
                  }
                  if (aria.utils.Dom.getStyle(elem, "display") == "none") {
                      return this.show(elem, properties, cfg);
                  } else {
                      return this.hide(elem, properties, cfg);
                  }
              }