docs: function (event) {
              // PROFILING // var profilingId = this.$startMeasure("handle key " + String.fromCharCode(event.charCode)
              // PROFILING // + " (" + event.charCode + ")");
              if (this.controller) {
                  if (!event.ctrlKey && !event.altKey) {
                      // we ignore CTRL+ / ALT+ key presses
                      this._checkKeyStroke(event);
                  } else {
                      // alt or ctrl keys are pressed
                      // we check that copy/paste content is correct
                      ariaCoreTimer.addCallback({
                          fn : this._checkKeyStroke,
                          scope : this,
                          args : event,
                          delay : 4
                      });
                  }
              }
              // PROFILING // this.$stopMeasure(profilingId);
          }