I've been checking similar posts and none of the solutions I've found have worked. Here's all of those code. I don't get any errors in the console.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>jQuery UI Test Holder</title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/fancybox/2.1.5/jquery.fancybox.css" type="text/css" media="screen" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/fancybox/2.1.5/jquery.fancybox.pack.js"></script>
<script>
$(document).ready(function(){
$('.open').fancybox({
type:"iframe"
});
});
</script>
</head>
<body>
<a class="open" href="https://google.com">OPEN</a>
</body>
</html>