code: function (element) {
          if (element === null ||
              !element.tagName ||
              !element.childNodes) {
              throw {
                  name: "StropheError",
                  message: "Cannot queue non-DOMElement."
              };
          }
  
          this._data.push(element);
      }
docs: PrivateFunction: _queueData
  Queue outgoing data for later sending.  Also ensures that the data
  is a DOMElement.