Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Safari/605.1.15
Safari 13
Mac OS X 10.15.1
Desktop
5 years ago
Test name Executions per second
querySelectorAll 918293.0 Ops/sec
getElementsByClassName 1436991.0 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')