Run results for: getElementById vs querySelector (class vs id)

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0

Browser: Firefox 139

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

getElementById

4.7M/s

querySelector

3.5M/s

View exact numbers

Test name	Executions per second
✓ getElementById	4,748,257 Ops/sec
querySelector	3,526,864 Ops/sec

HTML Preparation code:

<div id="t" class="t"></div>

Tests:

getElementById
var el = document.getElementById('t'); var className = el.className;
querySelector
var el = document.querySelector('.t'); var className = el.className;