Run results for: DataAttribute vs Class Selector vs ID Selector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/128.0.6613.98 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 128

Operating system: iOS 17.6

Device Platform: Mobile

Date tested: one year ago

Class

6.4M/s

data attribute

5.5M/s

5.4M/s

View exact numbers

Test name	Executions per second
✓ Class	6,350,676 Ops/sec
data attribute	5,535,382 Ops/sec
ID	5,378,057 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]');