On the Steam Deck there was no way out of fullscreen — no F11 key, and the
header bar (with the fullscreen button) is hidden while fullscreen.
- Controller: a Moonlight-style escape chord (L1+R1+Start+Select) held
together leaves fullscreen and releases input capture. The gamepad
service latches the chord (fires once per press) and signals the stream
page over an async channel; four simultaneous buttons no game uses as a
deliberate combo, so it can't trigger during play.
- Keyboard: F11 already toggled fullscreen (checked before input
forwarding, so it works while captured) — now surfaced.
- Discoverability: entering fullscreen flashes a 4s hint listing both
exits (F11 · L1+R1+Start+Select).
The escape future is aborted on page-hidden so a stale session can't act
on the shared window.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
67608944f0