code: function() {
  
                      if ( debug ) {
                          _checkElements();
                      }
  
                      // Append classes to Offside instance (.offside and .offside{slidingSide})
                      addClass( offside, offsideClass );
                      addClass( offside, offsideSideClass );
  
                      // Toggle Offside on click event
                      offsideButtons.forEach( function( item ) {
                          addEvent( item, 'click', _onButtonClick );
                      });
  
                      // Init callback
                      offsideSettings.init();
                  }
docs: Offside instance id Offside instance private methods