Run results for: setAttribute(...) vs. classList.add(...) vs classList.value vs className

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0

Browser: Firefox 91

Operating system: Windows 8.1

Device Platform: Desktop

Date tested: one year ago

HTML Preparation code:

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

Tests:

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