HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>max-age attribute</title>
</head>
<body>
  <h1>max-age (7 days)</h1>
  <button type="button" id="run">Set prefs</button>
  <button type="button" id="refresh">Refresh max-age</button>
  <pre id="out"></pre>
  <script>
    var sevenDays = 7 * 24 * 60 * 60;

    document.getElementById("run").addEventListener("click", function () {
      document.cookie = "prefs=compact; max-age=" + sevenDays + "; path=/; SameSite=Lax";
      document.getElementById("out").textContent = document.cookie;
    });

    document.getElementById("refresh").addEventListener("click", function () {
      document.cookie = "prefs=compact; max-age=" + sevenDays + "; path=/; SameSite=Lax";
      document.getElementById("out").textContent =
        "Sliding expiration refreshed\n\n" + document.cookie;
    });
  </script>
</body>
</html>

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Live Preview Auto-refresh on Run

JavaScript Cookies Expires — max-age (Try It)