Run results for: setAttribute vs classList.add (attribute adding)

Run details:

User agent: Mozilla/5.0 (Android 10; Mobile; rv:90.0) Gecko/90.0 Firefox/90.0

Browser: Firefox Mobile 90

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
classList.add	1546603.6 Ops/sec
setAttribute	1020.5 Ops/sec

HTML Preparation code:

<div id="test" class="first">Testing</div>

Script Preparation code:

var el = document.getElementById('test');

Tests: