Run results for: querySelectorAll vs getElementsByTagName

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; EVR-AL00) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Mobile Safari/537.36

Browser: Chrome Mobile 92

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
querySelectorAll	5845.4 Ops/sec
getElementsByTagName	4157.6 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) { console.log(div); });
getElementsByTagName
const allDivs = document.getElementsByTagName('div'); const arrayAllDivs = Array.from(allDivs); arrayAllDivs.forEach(function (div) { console.log(div); });