Checking svelte and bl.ocks.org
<!doctype html>
<html>
<head>
<meta charset='utf8'>
<meta name='viewport' content='width=device-width'>
<title>Svelte test</title>
<link rel='stylesheet' href='bundle.css'>
</head>
<body>
<script src='bundle.js'></script>
</body>
</html>