Run results for: className vs classList

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:151.0) Gecko/20100101 Firefox/151.0

Browser: Firefox 151

Operating system: Ubuntu

Device Platform: Desktop

Date tested: one month ago

classList

2K/s

className

2/s

View exact numbers

Test name	Executions per second
✓ classList	2,220 Ops/sec
className	2 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; var cl = element.classList; while (i--) { cl.add("bar"); }