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Run results for:
getElementById and getElementsByClassName [0] vs querySelector
Test performance of different ways of get just one particular DOM element
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=502004" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser:
Chrome 120
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
getElementById
13.9M/s
querySelector
7.1M/s
getElementById and getElementsByClassName
7.1M/s
View exact numbers
Test name
Executions per second
✓
getElementById
13,874,974 Ops/sec
querySelector
7,117,081 Ops/sec
getElementById and getElementsByClassName
7,057,708 Ops/sec
HTML Preparation code:
<div id="testdiv"> <div id="unique1" class="unique" name="unique" data-unique="1">test1</div> <div id="unique2" class="unique" name="unique" data-unique="2">test2</div> <div id="unique3" class="unique" name="unique" data-unique="3">test3</div> <div id="unique4" class="unique" name="unique" data-unique="4">test4</div> <div id="unique5" class="unique" name="unique" data-unique="5">test5</div> </div>
Script Preparation code:
var i, imax; var doc = document;
Tests:
getElementById
var test = doc.getElementById('testdiv').childNodes[0].innerHTML;
querySelector
var test = doc.querySelector('#testdiv .unique').innerHTML;
getElementById and getElementsByClassName
var test = doc.getElementById('testdiv').getElementsByClassName('unique')[0].innerHTML;