[POC] Ready. visibility=visible
[POC] Got transient user activation. Backgrounding this tab...
[POC] Page is HIDDEN. Sending VRService.RequestSession over Mojo...
[POC] (Blink xr_system.cc IsPageVisible() check is bypassed.)
[POC] Baseline (Blink path) rejected as expected: Failed to execute 'requestSession' on 'XRSystem': The page is not visible
[POC] Browser rejected: NO_RUNTIME_FOUND
[POC] No immersive XR runtime on this host. The browser-side handler still did NOT reject for visibility (there is no such error code). On Windows-OpenXR / Android-ARCore with VR permission already granted this request would have proceeded to RequestImmersiveSession and grabbed the headset from a hidden tab.

Full Chrome stderr saved to: /poc-artifacts/chrome_stderr.log