Run results for: DataAttribute vs Class Selector vs ID Selector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/124.0.6367.88 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 124

Operating system: iOS 17.4

Device Platform: Mobile

Date tested: 2 years ago

Class

5.9M/s

4.8M/s

data attribute

3.9M/s

View exact numbers

Test name	Executions per second
✓ Class	5,853,664 Ops/sec
ID	4,836,582 Ops/sec
data attribute	3,895,721 Ops/sec

HTML Preparation code:

<div class="hello" id="hello" data-hello>Hello</div>

Tests:

Class
document.querySelector('.hello');
ID
document.querySelector('#hello');
data attribute
document.querySelector('[data-hello]');