Run results for: querySelector vs getElementById

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

getElementsByClassName

9.7M/s

querySelector

6.3M/s

View exact numbers

Test name	Executions per second
✓ getElementsByClassName	9,684,943 Ops/sec
querySelector	6,284,561 Ops/sec

HTML Preparation code:

<html>
  <body>
    <div class="foo" id="test2"></div>
    <div class="foo2" id="test"></div>
  </body>
</html>

Tests: