Run results for: jQuery by className vs Document.getElementsByClassName

Run details:

User agent: Mozilla/5.0 (Linux; Android 6.0.1; SM-T800 Build/MMB29K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.126 Safari/537.36

Browser: Chrome 66

Operating system: Android 6.0.1

Device Platform: Samsung SM-T800

Date tested: 6 years ago

Test name	Executions per second
jQuery	47538.0 Ops/sec
Vanilla JS	231494.9 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;