HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Write cookie with max-age</title>
</head>
<body>
  <h1>Persistent cookie (7 days)</h1>
  <button type="button" id="set">Set cookie</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("set").addEventListener("click", function () {
      var sevenDays = 7 * 24 * 60 * 60;
      document.cookie = "prefs=compact; max-age=" + sevenDays + "; path=/";
      document.getElementById("out").textContent =
        "Set prefs=compact for 7 days\n\n" + document.cookie;
    });
  </script>
</body>
</html>

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