Browser & device API capability matrix

Every typed browser/device API wrapper Rask ships, and where it works. Inject the interface and the framework resolves the implementation for the host. Each API links to its own reference page; the narrative overview (with the three-homes rationale and the subscription pattern) is browser-apis.md. Everything else the browser ships — clipboard, geolocation, matchMedia, storage, screen, share, crypto, permissions, BroadcastChannel, media session, Web Locks, the storage estimate, device orientation and motion, the camera and microphone, speech synthesis and recognition, the screen wake lock, the install prompt, animations, fullscreen, Picture-in-Picture, files, gamepads, notifications, push subscription, the app badge, WebUSB, WebHID, Web Serial, Web Bluetooth — is MDN's own surface in Rask.Web.

Legend — ✅ injectable service · ⬜ not available · — n/a.

API	Web / Server	PWA / WASM
IIndexedDb	✅	✅
IWebAuthn	✅	✅
ISignaling	✅	✅
IWebRtc	✅	✅
IBackgroundSync	⬜	✅

Notes

• Web / Server is the ASP.NET host (per-session, over WebSocket). The transport-agnostic wrappers register there; activation-gated browser calls can't run from a handler there, but are reachable through declarative gesture components that run the call inside the click gesture. All six ship: Trigger.Fullscreen, Trigger.ScreenOrientation, Trigger.EyeDropper, Trigger.Install, Trigger.MediaCapture, and Trigger.PictureInPicture (plus the generic Trigger.Gesture). The last two target a <video> via its ElementRef. Trigger.MediaCapture's OnStream hands the stream over as an IJSObjectReference; wrap it with MediaStream.From(stream) from Rask.Web to stop it or show it.
• PWA / WASM is the in-browser WebAssembly host, which registers the full set.
• The wake lock is await Navigator.WakeLock.Request(WakeLockType.Screen) and the custom install button is Window.OnBeforeInstallPrompt(…) in Rask.Web. The wake lock works on both hosts; the install prompt's Prompt() needs a click, so it is WASM-only, and Trigger.Install covers the Server host. Push subscription, notifications and the app badge are MDN's PushManager, Notification and Navigator.SetAppBadge in Rask.Web.