JSFiddle - React, Tailwind, and code Playground

HTML

<div id="divID" data-what="Hello there"></div>

JavaScript

$(document).ready(function(){
    console.log("Hello world");
    console.log($("#divID").data("what"));
    console.log($("#divID").attr("data-what"));
    console.log($("#divID").data('what') ? $("#divID").data('what') : 'default_value');
    console.log($("#divID").data('notwhat') ? $("#divID").data('notwhat') : 'default_value');
});