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[css-env-1] values for hiding fullscreen browser UI #2872
Following on from #2871, the browser/host might show some UI when in fullscreen, but hide that UI after a while. For example, a video site that wants to show media in fullscreen with a custom UI will need to use #2871 to avoid the browser button to exit fullscreen. However, the browser doesn't want to constantly show the UI (distracting the user from the media).