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Run results for:
getElementsByClassName VS querySelectorAll (simple comparison)
A simple comparison of performance between these two methods. (Medium, @benlmsc)
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<iframe src="https://measurethat.net/Embed?id=622600" 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:
7 months ago
The method getElementsByClassName()
68.2M/s
The method querySelectorAll()
3.3M/s
View exact numbers
Test name
Executions per second
✓
The method getElementsByClassName()
68,163,384 Ops/sec
The method querySelectorAll()
3,318,920 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.getElementById("example container");
The method querySelectorAll()
document.querySelectorAll(".example.container");