JSFiddle - React, Tailwind, and code Playground

HTML

<button>Native Attribute Operat</button>
<button>JQuery Attr Operat</button>
<script src="http://code.jquery.com/jquery-1.6.1.min.js"></script>

JavaScript

var dbtn = document.getElementsByTagName('button');

dbtn[0].onclick = function(){
    this.setAttribute("followed", true);
    var f = this.getAttribute("followed");
    alert(f+'\n'+(f===true));
};

dbtn[1].onclick = function(){
    $(this).attr("followed", true);
    var f = $(this).attr("followed");
    alert(f+'\n'+(f===true));
};