Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36
Chrome 81
Mac OS X 10.15.3
Desktop
4 years ago
Test name Executions per second
querySelector 4232406.0 Ops/sec
getElementsByClassName 3309611.2 Ops/sec
HTML Preparation code:
AخA
 
1
<div class="test"></div>
Tests:
  • querySelector

     
    const x = document.querySelector(".test");
  • getElementsByClassName

     
    const y = document.getElementsByClassName("test")[0];