docs: function _abortAllRequests() {
          var req;
          while (this._requests.length > 0) {
              req = this._requests.pop();
              req.abort = true;
              req.xhr.abort();
              // jslint complains, but this is fine. setting to empty func
              // is necessary for IE6
              req.xhr.onreadystatechange = function () {}; // jshint ignore:line
          }
      }