Run results for: DataAttribute vs Class Selector vs ID Selector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/125.0.6422.33 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 125

Operating system: iOS 17.5

Device Platform: Mobile

Date tested: 2 years ago

Class

7.0M/s

6.1M/s

data attribute

5.5M/s

View exact numbers

Test name	Executions per second
✓ Class	7,008,599 Ops/sec
ID	6,137,374 Ops/sec
data attribute	5,487,390 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]');