Run results for: className vs. setAttribute vs. classList

Run details:

User agent: Mozilla/5.0 (Linux; Android 13; M2103K19Y Build/TP1A.220624.014) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.196 Mobile Safari/537.36

Browser: Chrome Mobile 114

Operating system: Android

Device Platform: Mobile

Date tested: 8 months ago

Test name	Executions per second
className	2461.8 Ops/sec
setAttribute	1424.1 Ops/sec
classList	1310.6 Ops/sec

HTML Preparation code:

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

Tests:

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