Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Android 10; Mobile; rv:90.0) Gecko/90.0 Firefox/90.0

Browser: Firefox Mobile 90

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
getElementById	2595543.0 Ops/sec
querySelector	1835259.0 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;