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/118.0.5993.2470 YaBrowser/23.11.0.2470 Yowser/2.5 Safari/537.36

Browser: Yandex Browser 23

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

classList.add

1.1M/s

setAttribute

1K/s

View exact numbers

Test name	Executions per second
✓ classList.add	1,088,763 Ops/sec
setAttribute	1,475 Ops/sec

HTML Preparation code:

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

Script Preparation code:

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

Tests:

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