code: function () {
              var i;
  
              stopTracking( this );
              this.element = null;
  
              for ( i = 0; i < MOUSETRACKERS.length; i++ ) {
                  if ( MOUSETRACKERS[ i ] === this ) {
                      MOUSETRACKERS.splice( i, 1 );
                      break;
                  }
              }
  
              THIS[ this.hash ] = null;
              delete THIS[ this.hash ];
          }
docs: Clean up any events or objects created by the tracker.
  @function