code: function(ev, hashId, keyCode) {
          var stopEvent;
          if (keyCode === keys.TAB ||
                  keyCode === keys.UP ||
                  keyCode === keys.DOWN) {
              stopEvent = true;
          } else if (hashId != 0 || keyCode != 0) {
              stopEvent = canon.execKeyCommand(this.env, 'cli', hashId, keyCode);
          }
          stopEvent && event.stopEvent(ev);
      }
docs: Ensure that TAB isn't handled by the browser