Run results for: DataAttribute vs Class Selector vs ID Selector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_5_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/137.0.7151.51 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 137

Operating system: iOS 18.5.0

Device Platform: Mobile

Date tested: one year ago

Class

12.1M/s

11.4M/s

data attribute

10.3M/s

View exact numbers

Test name	Executions per second
✓ Class	12,127,292 Ops/sec
ID	11,409,159 Ops/sec
data attribute	10,270,250 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]');