Run results for: getElementsByClassName()[0] vs querySelectorAll

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
By Class Name	5618364.5 Ops/sec
Query Selector	3699540.5 Ops/sec

HTML Preparation code:

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

Tests: