Run results for: jQuery 3.3.1 selector vs document.querySelector

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36

Browser: Chrome 65

Operating system: Mac OS X 10.11.6

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
jQuery 3.3.1	1134688.9 Ops/sec
Vanilla JS	2023223.5 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>
<div id="testElement"></div>

AخA
 
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js'></script>
<div id="testElement"></div>

Tests:

jQuery 3.3.1
var el = $("#testElement")[0]; var className = el.className;
var el = $("#testElement")[0];
var className = el.className;
Vanilla JS
var el = document.querySelector('#testElement'); var className = el.className;
var el = document.querySelector('#testElement');
var className = el.className;