HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>beforexrselect session</title>
</head>
<body>
  <div id="xr-overlay" style="padding:1rem;border:1px dashed #333;">Overlay</div>
  <pre id="out"></pre>
  <script>
    var out = document.getElementById("out");
    var overlay = document.getElementById("xr-overlay");
    overlay.addEventListener("beforexrselect", function (event) {
      out.textContent += "XRSession present: " + !!event.session + "\n";
      event.preventDefault();
    });
    out.textContent = "Waiting for beforexrselect (WebXR DOM overlay)...\n";
    out.textContent += "navigator.xr available: " + ("xr" in navigator);
  </script>
</body>
</html>

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Element beforexrselect — event.session (Try It)