Run results for: setAttribute(...) vs. classList.add(...) vs classList.value vs className (multiple classes, no override)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 8 months ago

HTML Preparation code:

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

Tests:

setAttribute(...)
var element = document.getElementById("foo"); var i = 100; while (i--) { element.setAttribute("class", element.className + " bar baz qwe"); }
classList.add
var element = document.getElementById("foo"); var i = 100; while (i--) { element.classList.add("bar", "baz", "qwe"); }
classList.value
var element = document.getElementById("foo"); var i = 100; while (i--) { element.classList.value = element.className + " bar baz qwe"; }
className
var element = document.getElementById("foo"); var i = 100; while (i--) { element.className = element.className + " bar baz qwe"; }