Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Android 8.0.0; Mobile; rv:123.0) Gecko/123.0 Firefox/123.0

Browser: Firefox Mobile 123

Operating system: Android 8.0.0

Device Platform: Mobile

Date tested: 2 years ago

getElementById

478K/s

querySelector

365K/s

View exact numbers

Test name	Executions per second
✓ getElementById	478,388 Ops/sec
querySelector	365,135 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;