JSFiddle - React, Tailwind, and code Playground

HTML

<div id="foo"></div>
<pre id="log"></pre>

JavaScript

var f=$("#foo");

f.attr("data-bar","baz");
_conout(f.data("bar"))
f.attr("data-bar","boom");
_conout(f.data("bar"))

function _conout(msg){
    var l=$("#log")
    l.html(l.html()+"\n"+msg);
}