Run results for: querySelectorAll vs. getElementsByClassName with forEach

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

getElementsByClassName

6.8M/s

querySelectorAll

1.3M/s

View exact numbers

Test name	Executions per second
✓ getElementsByClassName	6,789,869 Ops/sec
querySelectorAll	1,308,928 Ops/sec

HTML Preparation code:

<div class="test"></div>

Tests:

querySelectorAll
document.querySelectorAll(".test").forEach(x=>x.style.color='red')
getElementsByClassName
Array.from(document.getElementsByClassName(".test")).forEach(x=>x.style.color='red')