JSFiddle - React, Tailwind, and code Playground

HTML

<form id='theForm'>
    <button type="button" onclick="cre();">+</button>
    <button type="button" onclick="del();">-</button>
</form>

JavaScript

cre = function() {
    var t = document.createElement('select'),
        form = document.getElementById('theForm'),
        label = document.createElement('label'),
        textbox = document.createElement('input');
    
    form.appendChild(t);
    form.appendChild(label);
    form.appendChild(textbox);
}

/*{delete t,form,label,textbox;}*/
del = function() {
    var form=document.getElementById('theForm');
        var t = form.getElementsByTagName('select');
        var textbox = form.getElementsByTagName('input');
        if(t != 'undefined' && textbox != 'undefined')
        {
            form.removeChild(t[t.length-1]);
            form.removeChild(textbox[textbox.length-1]);
        }
}