Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Android 14; Mobile; rv:132.0) Gecko/132.0 Firefox/132.0

Browser: Firefox Mobile 132

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

getElementById

3.6M/s

querySelector

3.1M/s

View exact numbers

Test name	Executions per second
✓ getElementById	3,624,033 Ops/sec
querySelector	3,143,882 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;