Run results for: Add Class to existing className vs. setAttribute vs. classList

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: 2 years ago

HTML Preparation code:

<div id="foo" class="class1 class2"></div>

Tests:

classListVar
var element = document.getElementById("foo"); var i = 1000; var classListTemp = element.classList; while (i--) { classListTemp.add("class3"); }
setAttribute
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.setAttribute("class", "class1 class2 class3"); }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.add("class3"); }