Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Android 6.0.1; Mobile; rv:83.0) Gecko/83.0 Firefox/83.0

Browser: Firefox Mobile 83

Operating system: Android 6.0.1

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
getElementById	373288.1 Ops/sec
querySelector	299833.3 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;