Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36
Chrome 89
Windows
Desktop
3 years ago
Test name Executions per second
className 8094167.0 Ops/sec
classList 7062113.5 Ops/sec
HTML Preparation code:
AخA
 
1
<div id="foo" class="test"></div>
Script Preparation code:
 
var element = document.getElementById("foo");
Tests:
  • className

     
    element.className.indexOf("test")
  • classList

     
    element.className.startsWith("test");