JSFiddle - React, Tailwind, and code Playground

JavaScript

var btn=document.createElement("button");
var t=document.createTextNode("I'm a button, you know what to do");
btn.appendChild(t);
document.body.appendChild(btn);

btn.setAttribute('data-array','one,two,three');

btn.onclick = function() {
    var data = btn.getAttribute('data-array').split(',');
    console.log(data);
    var element=document.createElement("p");
    var textNode=document.createTextNode(data.join("..."));
    element.appendChild(textNode);
    document.body.appendChild(element);
}