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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=561625" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Browser:
Chrome 130
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
className
35K/s
setAttribute
23K/s
classList
10K/s
View exact numbers
Test name
Executions per second
✓
className
34,901 Ops/sec
setAttribute
23,411 Ops/sec
classList
10,251 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"); }