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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.4 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.4.1

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
TreeWalker	249619.2 Ops/sec
querySelectorAll	468899.1 Ops/sec
NodeIterator	399204.7 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);