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Run results for:
document.querySelector vs document.body.querySelector vs getElementsByClassName
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=599970" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36 Edg/135.0.0.0
Browser:
Chrome 135
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
querySelector
13568767.0 Ops/sec
querySelector.body
15292803.0 Ops/sec
getElementsByClassName
18459414.0 Ops/sec
getElementsByClassName BODY
14552429.0 Ops/sec
HTML Preparation code:
<div class="testElement"></div>
Tests:
querySelector
var el = document.querySelector('.testElement');
querySelector.body
var el = document.body.querySelector('.testElement');
getElementsByClassName
var el = document.getElementsByClassName('testElement');
getElementsByClassName BODY
var el = document.body.getElementsByClassName('testElement');