Run results for: TreeWalker for loop/(filter) vs querySelectorAll (filter )

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

TreeWalker

2.2M/s

querySelectorAll

1.8M/s

View exact numbers

Test name	Executions per second
✓ TreeWalker	2,182,569 Ops/sec
querySelectorAll	1,822,538 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, function(node) { return (node.nodeName == "H1") ? NodeFilter.FILTER_ACCEPT : NodeFilter.FILTER_REJECT; }, false ); for(let element; element; element = treeWalker.nextNode()) { element.className = 'new Class' }
querySelectorAll
const list = document.body.querySelectorAll('h1'); for(let i = 0, len = list.length ; i < len ; i++){ list[i].className = 'new Class' }