file_service_worker.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Bug 1208559 - ServiceWorker registration not governed by CSP</title>

</head>

<body>

<script>

  function finish(status) {

    window.parent.postMessage({result: status}, "*");

  const promises = [

    navigator.serviceWorker.ready,

    navigator.serviceWorker.register("file_service_worker.js", { scope: "." })

];

  Promise.race(promises).then(finish.bind(null, 'allowed'),

                              finish.bind(null, 'blocked'));

  </script>

</body>

</html>