HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>activeElement focusin</title>
</head>
<body>
  <p>Tab through the controls:</p>
  <label>Name <input id="name" type="text"></label><br>
  <label>Email <input id="email" type="email"></label><br>
  <button id="save" type="button">Save</button>
  <pre id="status">Waiting for focus...</pre>
  <script>
    document.addEventListener("focusin", function () {
      var active = document.activeElement;
      document.getElementById("status").textContent =
        "Focused: " + active.tagName.toLowerCase() +
        (active.id ? "#" + active.id : "");
    });
  </script>
</body>
</html>

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Document.activeElement — focusin log (Try It)