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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>resizeTo() — vs resizeBy</title>
</head>
<body>
  <h1>resizeTo vs resizeBy</h1>
  <button type="button" id="btn">resizeTo then resizeBy</button>
  <pre id="out">Waiting...</pre>
  <script>
    document.getElementById("btn").onclick = function () {
      window.resizeTo(800, 600);
      window.resizeBy(40, 20);
      document.getElementById("out").textContent =
        "Called both\nouter=" + window.outerWidth + "×" + window.outerHeight;
    };
  </script>
</body>
</html>

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JavaScript Window resizeTo() — vs resizeBy (Try It)