JSFiddle - React, Tailwind, and code Playground
HTML
<button onclick="addInput();" />Add</button>
<form id="test">
<input id="last" type="text" name="test[]" />
</form>
JavaScript
$(document).ready(function(){
$("button").click(function(){
$('<br><input placeholder="Attrib Name" type="text" name="atrname[]" /><input placeholder="Attrib Value" type="text" name="atrvalue[]" />').insertAfter("#last");
});
});