Run results for: className vs. setAttribute vs. classList vs. dataset

Run details:

User agent: Mozilla/5.0 (Linux; Android 12; IV2201) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.5249.126 Mobile Safari/537.36 OPR/72.3.3767.68685

Browser: Opera Mobile 72

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
className	2032.2 Ops/sec
setAttribute	1349.0 Ops/sec
classList	1371.0 Ops/sec
dataset	1088.6 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"); }
dataset
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.dataset.foo = 'bar'; }