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<head>
  <meta charset="utf-8">
  <title>getVRDisplays — detect</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var lines = [
      "getVRDisplays: " +
        (typeof navigator.getVRDisplays === "function" ? "available" : "missing"),
      "activeVRDisplays: " +
        ("activeVRDisplays" in navigator ? "available" : "missing"),
      "navigator.xr: " + ("xr" in navigator ? "available" : "missing")
    ];
    document.getElementById("out").textContent = lines.join("\n");
  </script>
</body>
</html>

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getVRDisplays — feature detect (Try It)