HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasUnpartitionedCookieAccess detect</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">Detect + check</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", async function () {
      var lines = [];
      lines.push("API present: " + (typeof document.hasUnpartitionedCookieAccess === "function"));
      if (typeof document.hasUnpartitionedCookieAccess !== "function") {
        lines.push("missing — try hasStorageAccess()");
      } else {
        lines.push("hasAccess: " + (await document.hasUnpartitionedCookieAccess()));
      }
      document.getElementById("out").textContent = lines.join("\n");
    });
  </script>
</body>
</html>

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Document.hasUnpartitionedCookieAccess — feature-detect (Try It)