Run results for: className vs. setAttribute vs. classList parte dos

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36

Browser: Chrome 84

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
className	4.8 Ops/sec
classList	4.7 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; while (i--) { element.classList.add("bar"); }