JSFiddle - React, Tailwind, and code Playground

HTML

<iframe width="50" height="50" src="https://www.youtube.com/embed/XiFkyR35v2Y" frameborder="0"></iframe>

<h1>Data vil blive vist her</h1>

JavaScript

try {
	var data = $("iframe").contents().find("body");
    $("h1").text(data);
} catch(err) {
	$("h1").text(err.message);
}