Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36 Edg/87.0.664.66
Chrome 87
Windows
Desktop
4 years ago
Test name Executions per second
querySelectorAll 496223.0 Ops/sec
getElementsByClassName 1253973.0 Ops/sec
HTML Preparation code:
AخA
 
1
<div class="test"></div>
Tests:
  • querySelectorAll

     
    document.querySelectorAll(".test").forEach(x=>x.style.color='red')
  • getElementsByClassName

     
    Array.from(document.getElementsByClassName(".test")).forEach(x=>x.style.color='red')