domReady.js

// Thank you, Dan Levy 

function domReady(f, o, m) {
  (o = document), (m = 'addEventListener');
  o[m] ? o[m]('DOMContentLoaded', f) : ((o = window), o.attachEvent('onload', f));
}


// example usage: 
domReady(function() {
  const form = document.querySelector('form');
  document.querySelector('form').addEventListener('change', getAdjective);
});