Run results for: className vs. setAttribute vs. classList

Run details:

User agent: Mozilla/5.0 (Linux; Android 7.0; BTV-DL09 Build/HUAWEIBEETHOVEN-DL09) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/6.4 Chrome/56.0.2924.87 Safari/537.36

Browser: Chrome 56

Operating system: Android 7.0

Device Platform: BTV-DL09

Date tested: 2024 years ago

Test name	Executions per second
className	698.2 Ops/sec
setAttribute	534.3 Ops/sec
classList	1528.2 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"); }