Check if any given script has errored on load

script-load-fail.js

var myScript = document.createElement('script'); 
myScript.src = 'http://www.madeupurl.com/script.js';
myScript.onload = function() { 
  console.log('Script loaded.');
};
myScript.onerror = function() { 
  console.log('script failed.');
};


document.head.appendChild(myScript);
//https://gist.github.com/AllThingsSmitty/889acd01889c84ff162c