HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Write cookie</title>
</head>
<body>
  <h1>Write cookie</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      document.cookie =
        "theme=dark; path=/; max-age=604800; SameSite=Lax";
      document.getElementById("out").textContent = document.cookie;
    })();
  </script>
</body>
</html>

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