According to HTML specification the poster attribute determines the
element's poster frame
(regardless of the value of the element's show poster flag).
https://html.spec.whatwg.org/multipage/#poster-frame
So the poster frame and the show poster flag is orthogonal to each
other, the latest one only controls
when browser should display the poster frame and should do not block
accepting video frames
from media pipeline (e.g. on new_preroll callback from video sink).
During layout the video element should select the current frame which
will be presented
based on first matching condition from the list:
https://html.spec.whatwg.org/multipage/#the-video-element:the-video-element-7
Testing: Improvements in the following WPT tests
- html/canvas/element/manual/imagebitmap/createImageBitmap*
- html/semantics/embedded-content/the-canvas-element/*
Fixes: #37165
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Signed-off-by: Andrei Volykhin <andrei.volykhin@gmail.com>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
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