Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Android 9; Mobile; rv:68.0) Gecko/68.0 Firefox/68.0

Browser: Firefox Mobile 68

Operating system: Android

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
getElementById	430782.2 Ops/sec
querySelector	539620.5 Ops/sec

HTML Preparation code:

<div id="testElement"></div>

AخA
 
<div id="testElement"></div>

Tests:

getElementById
var el = document.getElementById('testElement'); var className = el.className;
var el = document.getElementById('testElement');
var className = el.className;
querySelector
var el = document.querySelector('#testElement'); var className = el.className;
var el = document.querySelector('#testElement');
var className = el.className;