Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.88 Safari/537.36
Chrome 79
Mac OS X 10.15.2
Desktop
5 years ago
Test name Executions per second
querySelector 3638761.5 Ops/sec
querySelectorAll 1385957.2 Ops/sec
getElementsByClassName 4700417.0 Ops/sec
querySelector (ID) 2494346.2 Ops/sec
getElementsByID 5085762.0 Ops/sec
HTML Preparation code:
AخA
 
1
<div class="test" id="test"></div>
Tests:
  • querySelector

     
    document.querySelector(".test")
  • querySelectorAll

     
    document.querySelectorAll(".test")
  • getElementsByClassName

     
    document.getElementsByClassName(".test")
  • querySelector (ID)

     
    document.querySelector("#test")
  • getElementsByID

     
    document.getElementById("test")