Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; Android 7.1.2; LM-X410.FN) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Mobile Safari/537.36

Browser: Chrome Mobile 84

Operating system: Android 7.1.2

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
getElementById	407416.3 Ops/sec
querySelector	270835.0 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;