Run results for: DataAttribute vs Class Selector vs ID Selector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 15_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6.3 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 15

Operating system: iOS 15.7.1

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
Class	3624921.0 Ops/sec
ID	3149747.0 Ops/sec
data attribute	3084822.2 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]');

Run results for: DataAttribute vs Class Selector vs ID Selector

Class

ID

data attribute