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  <meta charset="utf-8">
  <title>unlockOrientation MDN</title>
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  <pre id="out"></pre>
  <script>
    var unlockOrientation =
      screen.unlockOrientation ||
      screen.mozUnlockOrientation ||
      screen.msUnlockOrientation ||
      (screen.orientation && screen.orientation.unlock);
    var branch = "none";
    if (screen.unlockOrientation || screen.mozUnlockOrientation || screen.msUnlockOrientation) {
      branch = "legacy boolean unlock";
    } else if (screen.orientation && screen.orientation.unlock) {
      branch = "modern orientation.unlock (void)";
    }
    document.getElementById("out").textContent = JSON.stringify({
      typeofUnlock: typeof unlockOrientation,
      branch: branch,
      tip: "Prefer calling screen.orientation.unlock() directly in new code."
    }, null, 2);
  </script>
</body>
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Screen.unlockOrientation — MDN universal (Try It)