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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>width MDN</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var msg;
    if (window.screen.width >= 1024 && window.screen.height >= 768) {
      msg = "Resolution is 1024x768 or above";
    } else {
      msg = "Resolution is below 1024x768";
    }
    document.getElementById("out").textContent = msg;
  </script>
</body>
</html>

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Screen.width — MDN 1024x768 (Try It)