Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; Android 9; Mi A1 Build/PKQ1.180917.001) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.157 Mobile Safari/537.36 OPR/53.1.2569.142848

Browser: Opera Mobile 53

Operating system: Android

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
getElementById	630938.1 Ops/sec
querySelector	294591.2 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;