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

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Windows 7

Device Platform: Desktop

Date tested: 3 months ago

Benchmark engine: Benchmark.js

dataset

2K/s

className

2K/s

setAttribute

1K/s

classList

1K/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'; }