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Run results for:
getElementById and getElementsByClassName[0] unique class
Test performance of different ways of get just one particular DOM element
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<iframe src="https://measurethat.net/Embed?id=590819" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0
Browser:
Firefox 136
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
getElementById
28.9M/s
getElementById and getElementsByClassName
21.8M/s
View exact numbers
Test name
Executions per second
✓
getElementById
28,853,520 Ops/sec
getElementById and getElementsByClassName
21,813,820 Ops/sec
HTML Preparation code:
<div id="testdiv"> <div id="unique1" class="unique" name="unique" data-unique="1">test1</div> <div id="unique2" class="unique1" 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;
getElementById and getElementsByClassName
var test = doc.getElementsByClassName('unique1')[0].innerHTML;