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Run results for:
className vs. setAttribute vs. classList
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=539122" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:130.0) Gecko/20100101 Firefox/130.0
Browser:
Firefox 130
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
className
47K/s
setAttribute
32K/s
classList
14K/s
View exact numbers
Test name
Executions per second
✓
className
47,056 Ops/sec
setAttribute
31,545 Ops/sec
classList
13,831 Ops/sec
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"); }