Re: [w3ctag/design-reviews] Wide gamut support for Canvas/OffscreenCanvas/ImageBitmap (#315)

A few questions to start:
* how does this relate to the wide-gamut work happening in CSS (primarily in [css-color-4](https://drafts.csswg.org/css-color-4/), I think)?  See in particular the [section on Profiled, Device-dependent Colors](https://drafts.csswg.org/css-color-4/#icc-colors) (although I'm really not a fan of that section name).  /cc @svgeesus @grorg @smfr
* what happens with color spaces here?  It seems like that's an essential part of the problem space given that it's my understanding that sRGB isn't well-defined outside of [0, 1].  It seems to be discussed in the explainer but not in the proposed spec changes.
* how does this relate to capabilities of the OS or device?  @slightlyoff alludes to that [above](https://github.com/w3ctag/design-reviews/issues/315#issuecomment-436333051), but I don't see the relationship explained in the explainer.
* how do the proposed solutions relate to the three use cases given at the top of the explainer?  And what application use cases benefit from those (still mostly very technical) use cases?  Are the proposed solutions sufficient for those applications?
* the explainer says that 12 bits is needed for rec2020, but then suggests float16, which has 11 bits of precision.  Is that good enough?

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