Run results for: test children matches vs classList vs querySelectorAll vs getElementsByClassName v.2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

getElementsByClassName

25.2M/s

querySelectorAll

77K/s

className (for)

9K/s

matches (for)

9K/s

className (filter)

9K/s

classList (filter)

9K/s

matches (filter)

9K/s

classList (for)

9K/s

View exact numbers

Test name	Executions per second
✓ getElementsByClassName	25,232,930 Ops/sec
querySelectorAll	77,338 Ops/sec
className (for)	9,227 Ops/sec
matches (for)	9,170 Ops/sec
className (filter)	9,146 Ops/sec
classList (filter)	9,125 Ops/sec
matches (filter)	8,952 Ops/sec
classList (for)	8,521 Ops/sec

HTML Preparation code:

<div id="test"></div>

Script Preparation code:

const count = 1000;
const holder = document.getElementById('test');

for (let i = 0; i < count; i++) {
   let elem = document.createElement('div');
   elem.classList.add(0|Math.random()*2 ? 'foo' : 'bar');
   holder.appendChild(elem);
}

Tests:

matches (filter)
const result = Array.from(holder.children).filter((node) => node.matches('.foo'));
matches (for)
const result = []; for (const child of holder.children) { if (child.matches('.foo')) result.push(child); }
classList (filter)
const result = Array.from(holder.children).filter((node) => node.classList.contains('foo'));
classList (for)
const result = []; for (const child of holder.children) { if (child.classList.contains('foo')) result.push(child); }
className (filter)
const result = Array.from(holder.children).filter((node) => node.className.includes('foo'));
className (for)
const result = []; for (const child of holder.children) { if (child.className.includes('foo')) result.push(child); }
querySelectorAll
const result = holder.querySelectorAll(':scope > .foo');
getElementsByClassName
const result = holder.getElementsByClassName('foo');