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one tap. Adam: Chrome's "v3.coinos.io – To exit full screen, drag from the top and touch the back button" shows every time, and a YouTube clip needs its own small full-screen icon. The notice is Chrome's, put up whenever a page goes full screen; a page can't turn it off, so the app goes full screen less. In the installed app (display-mode standalone, or opened from an android-app:// referrer) there is no address bar and the pager already fills the window, so it no longer goes full screen: a wide clip asks the screen to turn without it, and only if that's refused (the browser may allow turning only in full screen) goes full screen — the notice then, but the clip on its side; the screen is let go past that clip, or on closing. A browser tab goes full screen as before. A feed clip's own control bar loses its full-screen button (controlslist=nofullscreen): a tap on the clip is the way, into the pager. YouTube: the player's taps never reach the page, so a layer over a playing clip's picture takes them, leaving YouTube's control bar along the bottom to YouTube; one tap on it — or on the still — plays with sound and takes the clip's box full screen, turned on its side (unMute + playVideo through the iframe API for a player autoplaying muted); full screen the layer steps aside, so all of YouTube's controls are there. YouTube can only fill the screen through Chrome's full screen, so its notice still shows there. tools/fullscreen-notice-test.js (installed app: no full screen, the screen turned and let go, the fallback when turning is refused; no full-screen button on feed clips); tools/youtube-tap-test.js (YouTube stood in for: autoplaying muted, a tap on the control bar stays YouTube's, one tap full screen with unMute and playVideo, the layer aside full screen and back after; with Data Saver, the still to full screen with sound); video-unmute-test stubs ui for its slice of videoNode.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01KPw21NEpWeTGu6swVASmBt
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