Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Android 14; Mobile; rv:131.0) Gecko/131.0 Firefox/131.0

Browser: Firefox Mobile 131

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

getElementById

6.0M/s

querySelector

4.5M/s

View exact numbers

Test name	Executions per second
✓ getElementById	5,977,963 Ops/sec
querySelector	4,461,188 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;