JSFiddle - React, Tailwind, and code Playground

HTML

<label>Post this:</label>
<input type="text" name="postHere" />
<br />
<br />
<button>Post</button>
<table></table>

JavaScript

var btn = document.getElementsByTagName("button")[0];
var inpt = document.getElementsByName("postHere")[0];
var cnt = 0;

btn.onclick = function() {
    if (!inpt.value) alert("Hey! You didn't enter anything!");
    else alert("The field contains the text: " + inpt.value);
    var tbl = document.getElementsByTagName("table")[0];
    var row = tbl.insertRow(cnt++);
    var cell = row.insertCell(0);
    var txt = document.createTextNode(inpt.value);
    cell.appendChild(txt);
    //cnt++;
};