Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Android 12; Mobile; rv:126.0) Gecko/126.0 Firefox/126.0

Browser: Firefox Mobile 126

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

getElementById

3.9M/s

querySelector

3.0M/s

View exact numbers

Test name	Executions per second
✓ getElementById	3,942,220 Ops/sec
querySelector	2,953,962 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;