Run results for: classList.contains VS className.includes

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Safari/605.1.15

Browser: Safari 16

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
className.includes	2596.5 Ops/sec
classList.contains	3928.9 Ops/sec

HTML Preparation code:

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

Tests:

className.includes
let el = document.getElementById("foo"), i = 10000; while (i--) { el.className?.includes("test"); }
classList.contains
let el = document.getElementById("foo"), i = 10000; while (i--) { el.classList?.contains("test"); }