Chrome fullscreen desync: window fullscreen persists after exiting video fullscreen

[imprakhartripathi]

Summary

When fullscreening a video in Google Chrome under COSMIC, window-level fullscreen and DOM (video) fullscreen become desynchronized. Exiting fullscreen only exits the video, while the window remains fullscreen.

Steps to Reproduce

1. Open Google Chrome
2. Open any video site (e.g. YouTube)
3. Press f or click the fullscreen button on the video
4. First fullscreen: the entire page/window goes fullscreen, video remains embedded
5. Second fullscreen: the video itself goes fullscreen
6. Press ESC

Expected Behavior

ESC should exit fullscreen entirely (both video and window), restoring the normal windowed browser state.

Actual Behavior

ESC exits only the video fullscreen. The Chrome window remains fullscreen. Further presses of f only toggle the video, not the window.

Additional Notes

• Firefox behaves correctly under the same COSMIC session
• Issue occurs with both keyboard and mouse fullscreen
• Issue occurs even when running Chrome with --ozone-platform=x11
• This appears to be a compositor-level fullscreen state handling issue

Environment

• OS: Pop!_OS 24.04 LTS
• Session: COSMIC
• XDG_SESSION_TYPE: wayland
• Kernel: 6.17.9-76061709-generic
• GPU: Intel Xe (Alder Lake)
• Browser: Google Chrome (stable)

[tobiasboyd]

I see the same behavior in Brave.

[imprakhartripathi]

I see the same behavior in Brave.
@tobiasboyd
It usually works fine on Firefox, but who is switching to firefox lol 😂

[sevi-sqwish]

I can also confirm, using both chrome and brave, both doing this. Easy to reproduce: try to play a youtube video in fullscreen and try to exit it. It will get stuck.

[Lyceris-chan]

an easy work around for now is to not have chromium based browsers maximized as that causes the issue if you stretch them and then do fullscreen it works as expected