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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>xr — migrate</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    function pickImmersiveApi() {
      if ("xr" in navigator && navigator.xr) {
        return "Use WebXR via navigator.xr";
      }
      if ("activeVRDisplays" in navigator) {
        return "Legacy WebVR detected — do not use for new apps";
      }
      return "No WebXR / WebVR entry point — show 2D fallback";
    }
    document.getElementById("out").textContent = pickImmersiveApi();
  </script>
</body>
</html>

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xr — prefer WebXR over WebVR (Try It)