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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>activeVRDisplays — WebXR</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    function describeVrApis() {
      if (navigator.xr) {
        return "Use WebXR via navigator.xr (recommended)";
      }
      if ("activeVRDisplays" in navigator) {
        return "Only legacy WebVR activeVRDisplays found";
      }
      return "No WebXR or WebVR entry points detected";
    }
    document.getElementById("out").textContent = describeVrApis();
  </script>
</body>
</html>

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activeVRDisplays — prefer WebXR (Try It)