Run results for: Set className vs. setAttribute vs classList

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.116 Safari/537.36

Browser: Chrome 80

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").cloneNode(true); var i = 1000; while (i--) { element.className = (element.className || '') + "bar-" + i; }
setAttribute
var element = document.getElementById("foo").cloneNode(true); var i = 1000; while (i--) { element.setAttribute("class", element.getAttribute("class") + "bar-" + i); }
classList
var element = document.getElementById("foo").cloneNode(true); var i = 1000; while (i--) { element.classList.add("bar-" + i); }