Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 138

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

getElementById

14.4M/s

querySelector

4.2M/s

View exact numbers

Test name	Executions per second
✓ getElementById	14,362,186 Ops/sec
querySelector	4,219,806 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;