HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>moveBy() — button</title>
</head>
<body>
  <button type="button" id="moveBtn">Nudge window</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("moveBtn").onclick = function () {
      window.moveBy(20, 10);
      document.getElementById("out").textContent = "Window nudged by (20, 10).";
    };
  </script>
</body>
</html>

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JavaScript moveBy() — button nudge (Try It)