Run results for: getElementsByClassName VS querySelectorAll (simple comparison)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:96.0) Gecko/20100101 Firefox/96.0

Browser: Firefox 96

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
The method getElementsByClassName()	8980689.0 Ops/sec
The method querySelectorAll()	1208309.8 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");

Run results for: getElementsByClassName VS querySelectorAll (simple comparison)

A simple comparison of performance between these two methods. (Medium, @benlmsc)

The method getElementsByClassName()

The method querySelectorAll()