Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; SAMSUNG SM-N950F Build/PPR1.180610.011) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/9.4 Chrome/67.0.3396.87 Mobile Safari/537.36

Browser: Chrome Mobile 67

Operating system: Android

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
getElementById	833094.6 Ops/sec
querySelector	501868.3 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;