HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasUnpartitionedCookieAccess fallback</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <button id="btn" type="button">Run helper</button>
  <pre id="out">Click the button</pre>
  <script>
    async function hasUnpartitionedCookies() {
      var fn =
        typeof document.hasStorageAccess === "function"
          ? document.hasStorageAccess.bind(document)
          : typeof document.hasUnpartitionedCookieAccess === "function"
            ? document.hasUnpartitionedCookieAccess.bind(document)
            : null;
      if (!fn) return { supported: false, hasAccess: null };
      return { supported: true, hasAccess: await fn() };
    }
    document.getElementById("btn").addEventListener("click", async function () {
      document.getElementById("out").textContent = JSON.stringify(
        await hasUnpartitionedCookies(),
        null,
        2
      );
    });
  </script>
</body>
</html>

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Document.hasUnpartitionedCookieAccess — fallback helper (Try It)