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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36 Edg/135.0.0.0

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: 27 days ago

Test name	Executions per second
classList.add	4131483.2 Ops/sec
setAttribute	2752.2 Ops/sec

HTML Preparation code:

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

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

Script Preparation code:

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

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

Tests:

classList.add
el.classList.add("second");
el.classList.add("second");
setAttribute
el.setAttribute("class", el.className + " second");
el.setAttribute("class", el.className + " second");