JSFiddle - React, Tailwind, and code Playground

HTML

<input id="items" type="text" value="">
<input id="start" type="text" value="">
<input id="end" type="text" value="">
<input id="btn" type="submit" value="Generate">
<br>
<br>
<textarea id="output"></textarea>

JavaScript

var btn = document.getElementById('btn');
var output = document.getElementById('output');

btn.addEventListener('click', function() {
var items = document.getElementById('items').value;
var i = document.getElementById('start').value;
var e = document.getElementById('end').value;
    for(i; i < e; i++) {
        output.value += items+'/'+i+'\n';
    }
}, false);