JSFiddle - React, Tailwind, and code Playground

by Alex Alex

HTML

<iframe src="#" id="iframe" name="iframe"></iframe>
<form action="http://api.stlouisfed.org/fred/releases/dates" target="iframe" method="get">
    <input type="hidden" name="api_key" value="1cee0e87e5e3362716028352d3d1c160">
    <input type="submit" value="Get answer from API">
</form>

JavaScript

document.getElementById('iframe').onload = function () {
    alert(this.contentWindow.document.body.innerHTML);
}