Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; SM-G973F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.127 Mobile Safari/537.36 OPR/60.2.3004.55409

Browser: Opera Mobile 60

Operating system: Android

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
getElementById	1986163.6 Ops/sec
querySelector	1037034.8 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;