// Can do recursively find nextRightSibling of parent and get its first child to get the target node's next right sibling
function nextRightSibling(root, target) {
  // If target is null, there is no next right sibling
  if (!target) {
    return null;
  }
  // Check target's immediate nextElementSibling to see if there is a next sibling on the same level
  if (target.nextElementSibling) {
    return target.nextElementSibling;
  }

  let parent = target.parentElement;
  while (parent) {
    parent = nextRightSibling(root, parent);
    if (parent && parent.firstElementChild) {
      return parent.firstElementChild;
    }
  }

  return null;
}