HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>beforexrselect feature detect</title>
</head>
<body>
  <div id="xr-overlay" style="padding:1rem;border:1px solid #666;">Overlay root</div>
  <pre id="out"></pre>
  <script>
    function isBeforeXrSelectLikelyAvailable() {
      return (
        "xr" in navigator &&
        ("onbeforexrselect" in window || "onbeforexrselect" in HTMLElement.prototype)
      );
    }
    var out = document.getElementById("out");
    out.textContent = "WebXR navigator.xr: " + ("xr" in navigator) + "\n";
    out.textContent += "beforexrselect likely: " + isBeforeXrSelectLikelyAvailable() + "\n";
    if (isBeforeXrSelectLikelyAvailable()) {
      document.getElementById("xr-overlay").addEventListener("beforexrselect", function (e) {
        e.preventDefault();
      });
      out.textContent += "Listener attached with preventDefault\n";
    } else {
      out.textContent += "Plan a non-overlay or non-XR UI fallback";
    }
  </script>
</body>
</html>

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Element beforexrselect — feature detect (Try It)