JSFiddle - React, Tailwind, and code Playground

HTML

<div id="dialog">
    <iframe id="myIframe" src="/AJ6kH/show"></iframe>
</div>
<button id="dialogBtn">Abrir dialog</button>

JavaScript

$("#dialog").dialog({
    autoOpen: false,
    modal: true,
    height: 600,
    open: function (ev, ui) {
        var iFrame = $('#myIframe')[0].contentWindow;
        iFrame.receberDadosExternos('Olá!!');
    }
});

$('#dialogBtn').click(function () {
    $('#dialog').dialog('open');
});