Run results for: TreeWalker vs querySelectorAll vs NodeIterator + filter HTMLElement

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser: Chrome 125

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

TreeWalker

373K/s

NodeIterator

320K/s

querySelectorAll

217K/s

View exact numbers

Test name	Executions per second
✓ TreeWalker	372,647 Ops/sec
NodeIterator	319,612 Ops/sec
querySelectorAll	216,751 Ops/sec

HTML Preparation code:

<!-- article out start -->
<article>
  <!-- article in start -->
  <h1>Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
  <!-- article in end -->
</article>
<!-- article out end -->

<!-- article out start -->
<article>
  <!-- article in start -->
  <h1>Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
  <!-- article in end -->
</article>
<!-- article out end -->

<!-- article out start -->
<article>
  <!-- article in start -->
  <h1>Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
  <!-- article in end -->
</article>
<!-- article out end -->

Tests:

TreeWalker
const treeWalker = document.createTreeWalker( document.body, NodeFilter.SHOW_ELEMENT, ); const list = []; let element; while (element = treeWalker.nextNode()) { list.push(element); } const elements = list.filter(el => el instanceof HTMLElement);
querySelectorAll
const elements = Array.from(document.body.querySelectorAll('*')).filter(node => node instanceof HTMLElement);
NodeIterator
const nodeIterator = document.createNodeIterator( document.body, NodeFilter.SHOW_ELEMENT, ); const list = []; let element; while (element = nodeIterator.nextNode()) { list.push(element); } const elements = list.filter(el => el instanceof HTMLElement);