Run results for: DataAttribute vs Class Selector vs ID Selector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/130.0.6723.90 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 130

Operating system: iOS 18.1

Device Platform: Mobile

Date tested: one year ago

Class

6.2M/s

data attribute

5.3M/s

5.2M/s

View exact numbers

Test name	Executions per second
✓ Class	6,173,067 Ops/sec
data attribute	5,326,364 Ops/sec
ID	5,150,077 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]');