sample/authui-firebaseui/public/index.html (10 lines of code) (raw):
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>IAP External IDs Quickstart</title>
<!-- For IAP External IDs Quickstart Sample -->
<script src="script.js" type="text/javascript"></script>
</head>
<body>
<div id="firebaseui-container"></div>
</body>
</html>