HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>moveTo() — open features</title>
</head>
<body>
  <button type="button" id="openBtn">Open and fine-tune popup</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("openBtn").onclick = function () {
      var popup = window.open("", "Placed", "width=360,height=240,left=200,top=120");
      if (popup) {
        popup.moveTo(220, 140);
        document.getElementById("out").textContent = "Popup opened and fine-tuned.";
      } else {
        document.getElementById("out").textContent = "Popup blocked.";
      }
    };
  </script>
</body>
</html>

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JavaScript moveTo() — open with left/top (Try It)