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Run results for: JS getElementById vs querySelector vs getElementsByClassName

Speed of getElementById vs querySelector vs getElementsByClassName

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.54 Safari/537.36
Chrome 101
Mac OS X 10.15.7
Desktop
2 years ago
Test name Executions per second
getElementById 3692020.0 Ops/sec
querySelector (ID) 2101664.8 Ops/sec
querySelector (CLASSNAME) 3119377.8 Ops/sec
getElementsByClassName 2581611.8 Ops/sec
HTML Preparation code:
AخA
 
1
<div id="testDiv" class="test-div"></div>
Tests:

  • getElementById

     
    document.getElementById('testDiv');

  • querySelector (ID)

     
    document.querySelector('#testDiv');

  • querySelector (CLASSNAME)

     
    document.querySelector('.test-div');

  • getElementsByClassName

     
    document.getElementsByClassName('test-div')[0]