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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>open() — features</title>
</head>
<body>
  <button type="button" id="openBtn">Open positioned popup</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("openBtn").onclick = function () {
      var features = "width=480,height=320,left=120,top=80,scrollbars=yes";
      var popup = window.open("", "Guide", features);
      if (popup) {
        popup.document.write("<h1>Guide</h1><p>Custom size and position.</p>");
        popup.document.close();
        document.getElementById("out").textContent = "Guide opened with custom features.";
      } else {
        document.getElementById("out").textContent = "Popup blocked.";
      }
    };
  </script>
</body>
</html>

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JavaScript open() — features string (Try It)