Run results for: DataAttribute vs Class Selector vs ID Selector (extended)

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 13_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/80.0.3987.95 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 80

Operating system: iOS 13.3

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
class	4266338.0 Ops/sec
ID	3182251.5 Ops/sec
data-attribute	3525472.8 Ops/sec
data-attribute partial	2127288.2 Ops/sec
data-attribute exact	2373724.5 Ops/sec

HTML Preparation code:

<div class="hello" id="hello" data-hello data-test="hello-and-bye">Hello</div>

Tests:

class
document.querySelector('.hello');
ID
document.querySelector('#hello');
data-attribute
document.querySelector('[data-hello]');
data-attribute partial
document.querySelectorAll('[data-test~="hello"')
data-attribute exact
document.querySelectorAll('[data-test="hello-and-bye"]')

Run results for: DataAttribute vs Class Selector vs ID Selector (extended)

class

ID

data-attribute

data-attribute partial

data-attribute exact