Run results for: className vs classList

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; SNE-LX1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.98 Mobile Safari/537.36

Browser: Chrome Mobile 97

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
className	1762.7 Ops/sec
classList	1174.2 Ops/sec

HTML Preparation code:

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

Tests:

className
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.className = "bar"; }
classList
var element = document.getElementById("foo"); var i = 1000; var cl = element.classList; while (i--) { cl.add("bar"); }