Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0

Browser: Firefox 63

Operating system: Windows

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
getElementById	3068336.0 Ops/sec
querySelector	3319611.8 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;