Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0

Browser: Firefox 121

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

getElementById

3.0M/s

querySelector

2.1M/s

View exact numbers

Test name	Executions per second
✓ getElementById	3,032,682 Ops/sec
querySelector	2,052,734 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;