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Run results for:
Getting first element using querySelector vs querySelectorAll vs getElementsByClassName
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=629883" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:149.0) Gecko/20100101 Firefox/149.0
Browser:
Firefox 149
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 hours ago
Test name
Executions per second
querySelector()
2612339.2 Ops/sec
querySelectorAll()[0]
111915.3 Ops/sec
getElementsByClassname()[0]
3233478.8 Ops/sec
HTML Preparation code:
<div id="test-container"></div>
Script Preparation code:
{ const elementCount = 1000; const container = window.container = document.getElementById('test-container'); const fragment = document.createDocumentFragment(); const entities = window.entities = []; for (let i=0; i < elementCount; i++) { const element = document.createElement('div'); element.classList.add(`test-${i%4}`); element.setAttribute(`test`, i%4); fragment.append(element); entities.push(element); } container.append(fragment); }
Tests:
querySelector()
const randomID = 0|Math.random()*4; const result = window.container.querySelector(`.test-${randomID}`);
querySelectorAll()[0]
const randomID = 0|Math.random()*4; const result = window.container.querySelectorAll(`.test-${randomID}`)[0];
getElementsByClassname()[0]
const randomID = 0|Math.random()*4; const result = window.container.getElementsByClassName(`test-${randomID}`)[0];