I have touchstart to close sub menus on a mobile responsive menu. Unfortunatley on Safari this doesn't work. In other browsers it also sometimes gets stuck.

if ( event.type === 'touchstart' ) {

  const menuItem = this.parentNode;

  if ( event.cancelable ) event.preventDefault();

  for ( const link of menuItem.parentNode.children ) {

    if ( menuItem !== link ) {

      link.classList.remove( 'focus' );

    }

  }

menuItem.classList.toggle( 'focus' );

}