HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>orientation change modern</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var out = document.getElementById("out");
    if (screen.orientation && typeof screen.orientation.addEventListener === "function") {
      screen.orientation.addEventListener("change", function (event) {
        out.textContent = "ScreenOrientation change: " +
          event.target.type + ", " + event.target.angle + " degrees.";
      });
      out.textContent = "Listening on screen.orientation (preferred)";
    } else {
      out.textContent = "ScreenOrientation change not available";
    }
  </script>
</body>
</html>

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Screen orientationchange — modern (Try It)