Run results for: Comparison with className vs classList with unique value

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36

Browser: Chrome 77

Operating system: Mac OS X 10.14.0

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
classList with unique class	20.8 Ops/sec
className	23.1 Ops/sec
classList with multiple classes	23.0 Ops/sec

HTML Preparation code:

<div id="foo" class="test"></div>

Tests:

classList with unique class
var element = document.getElementById("foo"); var i = 1000; while (i--) { if(element.classList == 'test') { console.log('Equal'); } }
className
var element = document.getElementById("foo"); var i = 1000; while (i--) { if(element.className == 'test') { console.log('Equal'); } }
classList with multiple classes
var element = document.getElementById("foo"); var i = 1000; while (i--) { if(element.classList.contains('test')) { console.log('Contains'); } }