Run results for: setAttribute vs classList.add (attribute adding) V2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:86.0) Gecko/20100101 Firefox/86.0

Browser: Firefox 86

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
classList.add	2193957.0 Ops/sec
setAttribute	1713.4 Ops/sec

HTML Preparation code:

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

Script Preparation code:

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

Tests: