JSFiddle - React, Tailwind, and code Playground

HTML

<div class="myDiv" data-foo="bar"></div>

JavaScript

$(function(){
   
    var $myDiv = $(".myDiv");
    
    //Display value before changing the data
    alert($myDiv.data("foo")); //Displays "bar"
    
    //Change the data value
    $myDiv.data("foo", "baz");
    
    //Display the value after changing the data
    alert($myDiv.data("foo")) //Displays "baz"
    
    //Display the value of the elements "data-foo" attribute
    alert($myDiv.attr("data-foo")); //Displays "bar"
    
});