Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Ubuntu

Device Platform: Desktop

Date tested: one year ago

getElementById

6.6M/s

querySelector

4.1M/s

View exact numbers

Test name	Executions per second
✓ getElementById	6,621,586 Ops/sec
querySelector	4,106,844 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;