Run results for: querySelectorAll vs getElementsByTagName iteration with for

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:145.0) Gecko/20100101 Firefox/145.0

Browser: Firefox 145

Operating system: Windows

Device Platform: Desktop

Date tested: 9 months ago

getElementsByTagName

1.9M/s

querySelectorAll

1.0M/s

View exact numbers

Test name	Executions per second
✓ getElementsByTagName	1,866,385 Ops/sec
querySelectorAll	1,006,355 Ops/sec

HTML Preparation code:

<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>

Tests:

querySelectorAll
const allDivs = Array.from(document.querySelectorAll('div')); for (const div of allDivs){}
getElementsByTagName
const allDivs = document.getElementsByTagName('div'); for (const div of allDivs){}