JSFiddle - React, Tailwind, and code Playground

HTML

<div id="first" data-foo="attr value" >  </div>

JavaScript

var attr = $('#first').data('foo');
alert(attr); // alerts: attr value
$('#first').data('foo', 'data value');
var data = $('#first').data('foo');
alert(data); //alerts: data value
var attrAgain = $('#first').attr('data-foo');
alert(attrAgain); // alerts: attr value