Run results for: className vs setAttribute vs classList

Run details:

User agent: Mozilla/5.0 (iPhone14,3; U; CPU iPhone OS 15_0 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/10.0 Mobile/19A346 Safari/602.1

Browser: Mobile Safari 10

Operating system: iOS 15.0

Device Platform: Mobile

Date tested: 5 months ago

Test name	Executions per second
123456	123456.0 Ops/sec
123456&set /A 802297859+878999187	123456.0 Ops/sec
123456	123456.0 Ops/sec

HTML Preparation code:

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

Script Preparation code:

var element = document.getElementById('foo');

Tests:

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