Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

getElementById

7.0M/s

querySelector

4.7M/s

View exact numbers

Test name	Executions per second
✓ getElementById	7,030,800 Ops/sec
querySelector	4,678,621 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;