HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>activeElement default</title>
</head>
<body>
  <p>Nothing focused yet — check the output.</p>
  <pre id="out"></pre>
  <script>
    var active = document.activeElement;
    document.getElementById("out").textContent = [
      "tagName: " + active.tagName,
      "is body: " + (active === document.body),
      "is documentElement: " + (active === document.documentElement)
    ].join("\n");
  </script>
</body>
</html>

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Document.activeElement — default on load (Try It)