Run results for: classList.contains VS dataset

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:123.0) Gecko/20100101 Firefox/123.0

Browser: Firefox 123

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
className	11934.8 Ops/sec
classList	1447082.1 Ops/sec

HTML Preparation code:

<div id="foo" class="test" data-class-test="1" ></div>

Tests:

className
var element = document.getElementById("foo"); var i = 1000; while (i--) { if (element.dataset.classTest == 1) {} }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.contains("test"); }