Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.16; rv:81.0) Gecko/20100101 Firefox/81.0

Browser: Firefox 81

Operating system: Mac OS X 10.16

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
getElementById	4014521.8 Ops/sec
querySelector	2971312.0 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;