JSFiddle - React, Tailwind, and code Playground

HTML

<iframe id="meuIframe" style="display:none"></iframe>

<button id="meuBotao">Abrir iframe</button>

JavaScript

$(document).ready(function(){
   
    $('#meuBotao').click(function(){
        console.log('clicou');
        $('#meuIframe').attr('src', 'http://cnn.com').show();
    });
    
});