Run results for: querySelectorAll vs getElementsByTagName iteration

Run details:

User agent: Mozilla/5.0 (Android 15; Mobile; rv:139.0) Gecko/139.0 Firefox/139.0

Browser: Firefox Mobile 139

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

getElementsByTagName

402K/s

querySelectorAll

306K/s

View exact numbers

Test name	Executions per second
✓ getElementsByTagName	401,865 Ops/sec
querySelectorAll	306,456 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 = document.querySelectorAll('div'); allDivs.forEach(function (div) {});
getElementsByTagName
const allDivs = document.getElementsByTagName('div'); const arrayAllDivs = Array.from(allDivs); arrayAllDivs.forEach(function (div) {});