Run results for: className vs. getAttribute vs. classList

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

className

5K/s

setAttribute

4K/s

classList

3K/s

View exact numbers

HTML Preparation code:

<div id="foo" class="c1 c2 c3"></div>

Tests:

className
var element = document.getElementById("foo"); var i = 500; while (i--) { var z = element.className.split(/\s+/); var x = []; for (j = 0; j < z.length; j++) { x.push(z[j]); } }
setAttribute
var element = document.getElementById("foo"); var i = 500; while (i--) { var z = element.getAttribute('class').split(/\s+/); var x = []; for (j = 0; j < z.length; j++) { x.push(z[j]); } }
classList
var element = document.getElementById("foo"); var i = 500; while (i--) { var x = []; for (j = 0; j < element.classList.length; j++) { x.push(element.classList[j]); } }