A function to get elements by Attribute name

getElementsByAttribute.js

const getElementsByAttribute = (target, attr) => {
   const nodeArray = [];
   const considerNode = node => node.hasAttribute(attr) ? 1 : 3;
   const treeWalker = document.createTreeWalker(target, 1, { acceptNode: considerNode }, false);
   while(treeWalker.nextNode()) nodeArray.push(treeWalker.currentNode);
   return nodeArray
};