Run results for: jQuery by className vs Document.getElementsByClassName

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:89.0) Gecko/20100101 Firefox/89.0

Browser: Firefox 89

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
jQuery	356697.6 Ops/sec
Vanilla JS	905976.9 Ops/sec

HTML Preparation code:

<script type="text/javascript" src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.1.0.min.js"></script>
<div class="testElement"></div>

Tests:

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