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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36

Browser: Chrome 81

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

HTML Preparation code:

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

Tests:

className
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.className = "bar"; }
setAttribute()
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.setAttribute("class", "bar"); }
classList.add()
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.add("bar"); }
classList.value
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.value = "bar"; }