Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36
Chrome 115
Mac OS X 10.15.7
Desktop
one year ago
Test name Executions per second
getElementById 5497740.0 Ops/sec
querySelector (class) 4002229.2 Ops/sec
HTML Preparation code:
AخA
 
1
<div id="testElement" class="testClass"></div>
Tests:
  • getElementById

     
    var el = document.getElementById('testElement');
    var className = el.className;
  • querySelector (class)

     
    var el = document.querySelector('.testClass');
    var className = el.className;