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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=505116" 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/121.0.0.0 Safari/537.36
Browser:
Chrome 121
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
The method getElementsByClassName()
5.4M/s
The method querySelectorAll()
980K/s
View exact numbers
Test name
Executions per second
✓
The method getElementsByClassName()
5,388,264 Ops/sec
The method querySelectorAll()
979,717 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");