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Run results for: querySelector vs querySelectorAll vs getElementsByClassName vs querySelector (ID) vs getElementsByID

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:48.0) Gecko/20100101 Firefox/48.0
Firefox 48
Mac OS X 10.8
Desktop
2 years ago
Test name Executions per second
querySelector 2104523.8 Ops/sec
querySelectorAll 495433.3 Ops/sec
getElementsByClassName 18938004.0 Ops/sec
querySelector (ID) 2219701.5 Ops/sec
getElementsByID 18952608.0 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")