JSFiddle - React, Tailwind, and code Playground

HTML

<p id="sayHello"></p>

JavaScript

var yourName = window['prompt']("What is your name?");

    if (yourName === null & typeof(yourName) ==='object') {
       alert("Please enter your name next time");
    } else {
       document.getElementById("sayHello").innerHTML = "Hello " + yourName; 
    }