Run results for: className.indexOf vs. className.startsWith

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36

Browser: Chrome 89

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
className	8384486.5 Ops/sec
classList	7079263.0 Ops/sec

HTML Preparation code:

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

Script Preparation code:

var element = document.getElementById("foo");

Tests: