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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

getElementById

17.3M/s

querySelector

13.4M/s

View exact numbers

Test name	Executions per second
✓ getElementById	17,275,460 Ops/sec
querySelector	13,366,061 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;