addEventListener once - cross browser

addEventListener.js

// Regular version - unfortunately supported only by very lates browsers (chrome 60+, ff 55+, edge 16+, safari 10.1+)
el.addEventListener('eventName', fn, {once: true})

// decision - working everywhere
el.addEventListener('eventName', function cb(event) {
  // function code here
  
  event.currentTarget.removeEventListener(event.type, cb)
})

// all credits to https://developers.google.com/web/updates/2016/10/addeventlistener-once