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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getVRDisplays — list</title>
</head>
<body>
  <pre id="out">Working…</pre>
  <script>
    async function listVrDisplays() {
      if (typeof navigator.getVRDisplays !== "function") {
        return "getVRDisplays not supported";
      }
      try {
        var displays = await navigator.getVRDisplays();
        return "VR displays found: " + displays.length;
      } catch (err) {
        return "Error: " + err.name;
      }
    }
    listVrDisplays().then(function (msg) {
      document.getElementById("out").textContent = msg;
    });
  </script>
</body>
</html>

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getVRDisplays — list displays (Try It)