HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>activeElement read</title>
</head>
<body>
  <label>Search: <input id="search" type="search" placeholder="Click here"></label>
  <pre id="out">Click the input to see activeElement.</pre>
  <script>
    var input = document.getElementById("search");
    input.addEventListener("focus", function () {
      var active = document.activeElement;
      document.getElementById("out").textContent =
        active.tagName + "\n" + active.id;
    });
  </script>
</body>
</html>

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Document.activeElement — read focus (Try It)