Run results for: className vs classList add and remove

Run details:

User agent: Mozilla/5.0 (Android 12; Mobile; rv:107.0) Gecko/107.0 Firefox/107.0

Browser: Firefox Mobile 107

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
className	336.2 Ops/sec
classList	396.6 Ops/sec

HTML Preparation code:

<div id="foo"></div>

Tests:

className
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.className += " bar"; element.className = element.className.replace(' bar', ''); }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.add('bar'); element.classList.remove('bar'); }