Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; Android 7.0; Redmi Note 4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.59 Mobile Safari/537.36

Browser: Chrome Mobile 85

Operating system: Android 7.0

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
getElementById	538360.6 Ops/sec
querySelector	317397.5 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;