Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (iPad; CPU OS 14_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) GSA/169.0.385036250 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 14

Operating system: iOS 14.6

Device Platform: Tablet

Date tested: 2 years ago

Test name	Executions per second
getElementById	8365477.0 Ops/sec
querySelector	5612940.0 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;