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Run results for:
className vs. setAttribute vs. classList - exclusive
1000 exclusive class name
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=533376" 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/126.0.0.0 Safari/537.36
Browser:
Chrome 126
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
className
2277.2 Ops/sec
setAttribute
1855.4 Ops/sec
classList
60.1 Ops/sec
classList remove & add
668.8 Ops/sec
HTML Preparation code:
<div id="foo"></div>
Tests:
className
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.className = `bar-${i}`; }
setAttribute
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.setAttribute("class", `bar-${i}`); }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.add(`bar-${i}`); }
classList remove & add
var element = document.getElementById("foo"); var i = 999; element.classList.add(`bar-1000`); while (i--) { element.classList.remove(`bar-${i+1}`); element.classList.add(`bar-${i}`); }