compute-pressure

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https://webidl.spec.whatwg.org/#SameObject says

The [SameObject] extended attribute must not be used on anything other than a read only attribute whose type is an interface type or object.

supportedSources is a read-only attribute, but its type is not an interface type or object.

FrozenArray is an object

object in this case is https://webidl.spec.whatwg.org/#idl-object specifically. I don't think FrozenArray counts, but we could double check.

Not really sure where to double check that, but that would also explain why it has to be associated a global object (JavaScript realm)

@foolip do you know?

Not really sure where to double check that

It'd be good to file an issue in the Web IDL repository to ask about this. I can do that later if you don't beat me to it.

I think that as written the spec doesn't allow [SameObject] for FrozenArray but that seems unlikely to be intentional. A spec issue sounds good.

I've filed whatwg/webidl#1402.