JSFiddle - React, Tailwind, and code Playground

HTML

<input id="Text1" type="text" />
    <input id="Button1" type="button" value="Click Me" />
    <input id="Text2" type="text" />

JavaScript

var myButton;

    myButton = document.getElementById("Button1");
    myButton.onclick = function () {
        var val = document.getElementById("Text1").getAttribute("value");
        var val = document.getElementById("Text1").value;
        document.getElementById("Text2").setAttribute("value", val);
    };