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/80.0.3987.117 Mobile Safari/537.36

Browser: Chrome Mobile 80

Operating system: Android 7.0

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
getElementById	447065.4 Ops/sec
querySelector	269504.4 Ops/sec

HTML Preparation code:

<div id="testElement"></div>

AخA
 
<div id="testElement"></div>

Tests:

getElementById
var el = document.getElementById('testElement'); var className = el.className;
var el = document.getElementById('testElement');
var className = el.className;
querySelector
var el = document.querySelector('#testElement'); var className = el.className;
var el = document.querySelector('#testElement');
var className = el.className;