Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; Pixel 3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.94 Mobile Safari/537.36 Vivaldi/2.9.1741.39

Browser: Chrome Mobile 79

Operating system: Android

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
getElementById	2149085.0 Ops/sec
querySelector	1129241.0 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;