Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15
Safari 13
Mac OS X 10.15.5
Desktop
4 years ago
Test name Executions per second
querySelector 3857881.5 Ops/sec
getElementsByClassName 4128331.0 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];