Run results for: DataAttribute vs Class Selector vs ID Selector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/131.0.6778.73 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 131

Operating system: iOS 16.3.1

Device Platform: Mobile

Date tested: one year ago

Class

17.0M/s

8.1M/s

data attribute

8.1M/s

View exact numbers

Test name	Executions per second
✓ Class	17,027,042 Ops/sec
ID	8,142,838 Ops/sec
data attribute	8,085,804 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]');