HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>focus() — basic</title>
</head>
<body>
  <button type="button" id="focusBtn">Focus window</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("focusBtn").onclick = function () {
      window.focus();
      document.getElementById("out").textContent = "window.focus() called";
    };
  </script>
</body>
</html>

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JavaScript Window focus() — basic call (Try It)