Re: [w3c/manifest] Add support for defining a theme color for both light & dark modes (prefers color scheme) (#975)

> I like your first combined syntax, with media-conditions as keys, with nested objects.

That’s my preference as well. Not knowing the innards of browser engines, it also feels like it would be faster to process because you wouldn’t have to parse the object to determine whether you need to throw it away.

> If we were matching the way CSS works, I would expect last-take-precedence when there are multiple matches - but maybe first-takes-precedence fits the existing scheme better? I don't know.

This is the confusing piece, I agree. So we have 2 conflicting paths for this stuff: In CSS proximity wins whereas in things like `audio`, `video`, and `picture` the first match wins (even with `media` in play). Again, not knowing the browser innards well and going purely by the processing algorithms we define in the spec, I believe the first match winning is less computationally expensive overall, which is why I tend to lean in that direction.

I’d love someone with knowledge of the perf cost to weigh in here and set me straight if I’m incorrect.

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