code: function () {
          return Object.keys(this._attributes).map(function (name) {
              _gpfWebCheckNamespaceSafe(name);
              return " " + _gpfWebTagAttributeAlias(name)
                  + "=\"" + _gpfStringEscapeForHtml(this._attributes[name]) + "\"";
          }, this).join("");
      }
docs: region toString implementation