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

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 year ago

getElementsByClassName

4.7M/s

querySelector

3.1M/s

View exact numbers

Test name	Executions per second
✓ getElementsByClassName	4,702,342 Ops/sec
querySelector	3,134,311 Ops/sec

HTML Preparation code:

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

Tests: