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Run results for:
getElementsByClassName VS querySelectorAll (simple comparison) FIXED
A simple comparison of performance between these two methods. (Medium, @benlmsc)
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<iframe src="https://measurethat.net/Embed?id=622601" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.2 Safari/605.1.15
Browser:
Safari 26
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
4 months ago
Test name
Executions per second
The method getElementsByClassName()
58100964.0 Ops/sec
The method querySelectorAll()
3578728.2 Ops/sec
HTML Preparation code:
<div class="example container"></div> <div class="example container"></div> <div class="example container"></div> <div class="example container"></div> <div class="example container"></div> <div class="example container"></div> <div class="example container"></div> <div class="example container"></div> <div class="example container"></div> <div class="example container"></div>
Tests:
The method getElementsByClassName()
document.getElementsByClassName("example container");
The method querySelectorAll()
document.querySelectorAll(".example.container");