Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

getElementById

9.5M/s

querySelector

7.5M/s

View exact numbers

Test name	Executions per second
✓ getElementById	9,491,141 Ops/sec
querySelector	7,466,492 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;