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Run results for:
className vs. setAttribute vs. classList vs. dataset v2
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Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 26_2_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/144.0.7559.95 Mobile/15E148 Safari/604.1
Browser:
Chrome Mobile iOS 144
Operating system:
iOS 26.2.0
Device Platform:
Mobile
Date tested:
3 months ago
Test name
Executions per second
className
52910.5 Ops/sec
setAttribute
24367.3 Ops/sec
classList
22696.1 Ops/sec
dataset
10755.8 Ops/sec
HTML Preparation code:
<div id="foo"></div>
Tests:
className
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.className = "bar"; }
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'; }