dom-search.js

var root = document.getElementById('root'),


domSearch = function (root, className) {
  var stack = [root],
    foundNodes = [];

  while (stack.length > 0) {
    var nodeToCheck = stack.pop();
      
    if (nodeToCheck.children.length > 0) {
      for (var i = 0; i < nodeToCheck.children.length; i++) {
          stack.push(nodeToCheck.children[i]);
      }
    }
      
    if (nodeToCheck.className === className) {
      foundNodes.push(nodeToCheck);
    }
  }
  return foundNodes;
};


let foundNodes = domSearch(root, 'a');
 console.log(foundNodes.map(item => item.className))

selectorSearch = function (root, selector) {
  let foundNodes = [];
  let selectorMatch = root.querySelectorAll(selector);
  
  if (selectorMatch.length) {
    for (var i = 0; i < selectorMatch.length; i++) {
      foundNodes.push(selectorMatch[i]);
    }
  }

  return foundNodes;
};
let foundSelectorNodes = selectorSearch(root, '.a > .b  >.c');
console.log(foundSelectorNodes.map(item => item.innerHTML))

This is an example of using Queues or whatever to traverse through the DOM and find matching nodes for both a specific class name and querySelectorAll for a specific yup query