JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://sasi.pro/searchsn/new/moopopup-yc.js"></script>
<link rel="stylesheet" href="http://sasi.pro/searchsn/new/moopopup.css">
<span class="button link">run javascript</span>

<div id="newiframe">
    <iframe src="http://www.yr.no" id="newiframe" />
</div>

CSS

#newiframe {
    display:none;
    width:770px;
    height:300px;
    overflow:auto;
    z-index:-1;
}
.moopopup-body #newiframe {
    display:block;
}

JavaScript

var myIframe = document.id('newiframe');

function runExample3() {
    var mypopup3 = new moopopup({
        title: 'My home page',
        resizable: false,
        width: 800,
        max_body_height: 600,
        html_node: myIframe
    });
    mypopup3.display();
}

document.getElement('.button.link').addEvent('click', runExample3);

// window.addEvent('domready', function() { prettyPrint();});