Run results for: className vs setAttribute vs classList

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:89.0) Gecko/20100101 Firefox/89.0

Browser: Firefox 89

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

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"); }