<!doctype html>
<!-- comments_test.html -->
<html>
  <head>
    <title>Comments test</title>
     <script src="https://www.gstatic.com/firebasejs/7.6.1/firebase-app.js"></script>
      <script src="https://www.gstatic.com/firebasejs/7.6.1/firebase-auth.js"></script>
      <script src="https://www.gstatic.com/firebasejs/7.6.1/firebase-firestore.js"></script>
      <link rel="x-dart-test" href="comments_test.dart">
    <script src="packages/test/dart.js"></script>
  </head>
  <body>
    // ...
  </body>
</html>