HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>hasFocus activeElement</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} input,button{margin:0.35rem 0.35rem 0.35rem 0;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <input id="name" type="text" placeholder="Focus me">
  <button id="btn" type="button">Read focus state</button>
  <pre id="out">Click the button after focusing a control</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var active = document.activeElement;
      document.getElementById("out").textContent =
        "hasFocus: " + document.hasFocus() + "\n" +
        "activeElement: " + (active && active.tagName) +
        (active && active.id ? "#" + active.id : "");
    });
  </script>
</body>
</html>

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Document.hasFocus — with activeElement (Try It)