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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>storage — persisted</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    async function checkPersisted() {
      if (!navigator.storage || !navigator.storage.persisted) {
        return "persisted() not supported.";
      }
      var isPersisted = await navigator.storage.persisted();
      return "persisted: " + isPersisted;
    }
    checkPersisted().then(function (msg) {
      document.getElementById("out").textContent = msg;
    });
  </script>
</body>
</html>

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storage — persisted (Try It)