JSFiddle - React, Tailwind, and code Playground

HTML

<button>test</button>
<div id="loader"></div>
<div class="iframe">
    <iframe></iframe>
</div>

CSS

.iframe {border: 1px solid; width:500px; height:500px;}

JavaScript

$(document).ready(
    function(){
        $("button").click(function(){
            $("#loader").text("Loading...");
            $("iframe").load(function(){$("#loader").text("Loaded!");});
            $("iframe").attr("src","http://jfarcand.files.wordpress.com/2012/05/untitled.jpg");
        });
}
);