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chromium/chrome/test/data/push_messaging/test.html 

<!DOCTYPE html>
<html>
 <head>
  <title>Push API Test</title>
  <link rel="manifest" href="manifest.json">
  <script src="../format_error.js"></script>
  <script src="../result_queue.js"></script>
  <script src="push_constants.js"></script>
  <script src="push_test.js"></script>
 </head>
 <body>
   <h1>Push API Test</h1>
 </body>
</html>