HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>resizeTo() — basic</title>
</head>
<body>
  <button type="button" id="resizeBtn">Set size 800×600</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("resizeBtn").onclick = function () {
      window.resizeTo(800, 600);
      document.getElementById("out").textContent = "resizeTo(800, 600) called — may be blocked on main tabs.";
    };
  </script>
</body>
</html>

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JavaScript resizeTo() — set 800×600 (Try It)