Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Android 14; Mobile; rv:133.0) Gecko/133.0 Firefox/133.0

Browser: Firefox Mobile 133

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

getElementById

4.7M/s

querySelector

3.6M/s

View exact numbers

Test name	Executions per second
✓ getElementById	4,658,793 Ops/sec
querySelector	3,639,526 Ops/sec

HTML Preparation code:

<div id="testElement"></div>

Tests:

getElementById
var el = document.getElementById('testElement'); var className = el.className;
querySelector
var el = document.querySelector('#testElement'); var className = el.className;