service_worker_test.html

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<!DOCTYPE html>

<html>

  <head>

    <meta charset="utf-8">

    <meta http-equiv="Cache-Control" content="public" />

    <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1, maximum-scale=1">

    <title>Service Worker Test</title>

  </head>

  <body>

    <h1>Service Worker Test</h1>

    <script type="text/javascript">

      navigator.serviceWorker.register("service_worker_test.js")

               .then(() => document.body.setAttribute("data-test-service-worker-registered", "true"));

    </script>

  </body>

</html>