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Blanking the screen took three attempts on real hardware, and each failure was
the same lesson from a different angle:
1. black overlay -> the video played straight THROUGH it. With hwz
enabled the widget decodes onto a hardware plane and
the graphics plane sits behind it; z-index is
irrelevant across planes.
2. pause + hide element -> playback stopped and the LAST DECODED FRAME stayed
on screen. Hiding a DOM element does nothing to the
plane, which is not part of the DOM.
3. pause + remove src -> releases the plane. Black.
+ load()
Coming back re-mounts through nextItem(), because a torn-down element cannot be
resurrected. The playlist keeps advancing while the screen is off, so each newly
started item is torn down as well — caught on 'play' in the capture phase, or the
next video lights the panel back up a few seconds later.
CEC is now explicitly not load-bearing. Our XT245 logs "failed to get cec clock"
and does not respond to it at all, which is precisely why blanking cannot depend
on a cooperative display: plenty ignore broadcast CEC or need direct addressing.
displayPower() stays as opportunistic best-effort alongside the teardown.
Verified on hardware: not black, then frozen frame, then black.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Uaeo9MvzKoyXuN6ZsbhtkL
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