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For your second part you can @media(color-gamut: srgb) {} things (p3 and rec2020 are the other supported options) for the different pre-rendered images.
WebGL/Canvas methods will be possible but right now how that will all get implemented is still being worked on. https://github.com/WICG/canvas-color-space/blob/main/CanvasC...
> You have a good point that AVIF layered image items can act like such P/B-frames. Do libavif (or other AVIF implementations if any) make use of them?
Seemingly. As search for "libavif progressive encoding" shows several issues about this, and a search for "progressive" in https://github.com/AOMediaCodec/libavif/blob/main/include/av... shows an enum for avifProgressiveState, appears to show support for it.
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