Run results for: classList vs setAttribute

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser: Chrome 67

Operating system: Windows 7

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
classList	1799.3 Ops/sec
setProperty	5723.8 Ops/sec

HTML Preparation code:

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

Tests:

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