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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

querySelector

18.5M/s

getElementsByClassName

14.6M/s

View exact numbers

Test name	Executions per second
✓ querySelector	18,545,190 Ops/sec
getElementsByClassName	14,554,342 Ops/sec

HTML Preparation code:

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

Tests: