Run results for: className vs. setAttribute vs. classList vs. dataset v2

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36 Edg/109.0.1518.140

Browser: Chrome 109

Operating system: Windows 7

Device Platform: Desktop

Date tested: 2 months ago

Benchmark engine: Benchmark.js

className

2K/s

classList

827/s

setAttribute

816/s

dataset

684/s

View exact numbers

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.getElementsByTagName("div")[0]; var i = 1000; while (i--) { element.dataset.foo = 'bar'; }