JSFiddle - React, Tailwind, and code Playground

HTML

<div id="divContent">
    <input type="text" name="txt1"></input>
</div>

CSS

input
{
    margin-bottom: 10px;
    width: 260px;
    height: 20px;
}

JavaScript

var count = 1;

$(function() {
    $('input').focus(function() {
        addInputBox();
    });
});


function addInputBox()
{
    $('#divContent').append("<br />");
    $('#divContent').append("<input type='text' name='txt" + count +"' onFocus='addInputBox();'></input>");
    count++;
}