Run results for: className vs. setAttribute vs. classList

Run details:

User agent: Mozilla/5.0 (Linux; Android 7.0; SAMSUNG SM-G930W8 Build/NRD90M) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/5.0 Chrome/51.0.2704.106 Mobile Safari/537.36

Browser: Chrome Mobile 51

Operating system: Android 7.0

Device Platform: Samsung SM-G930W8

Date tested: 7 years ago

Test name	Executions per second
className	621.9 Ops/sec
setAttribute	767.7 Ops/sec
classList	1535.5 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"); }