6-line javascript code for lazy DFS over the DOM

searchDOM.js

function* search(node) {
  if (!node) return;
  yield node;
  yield* search(node.firstChild);
  yield* search(node.nextSibling);
}

// example usage
for (let node of search(document)) {
  if (node.localName === 'title') {
    console.log(node.textContent);
    break;
  }
}

// from: https://www.youtube.com/watch?v=cLxNdLK--yI