Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.1.0; Mi A1 Build/OPM1.171019.026) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36

Browser: Chrome Mobile 69

Operating system: Android 8.1.0

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
getElementById	557587.4 Ops/sec
querySelector	284026.7 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;