Re: [whatwg/webidl] IDL-level support for permission checks? (Issue #1066)

This is similar to something we drafted in https://wicg.github.io/nav-speculation/prerendering.html#delay-while-prerendering . If we can find enough specs that would use this then I'd be supportive. I suspect it might involve technically-backward-incompatible changes to exception ordering.

I would prefer starting only with the Promise variant, although gathering data on what specs would use this might change my mind there.

I don't understand why the type would need to be included in the arguments. I think you could just write in the spec for [Permission] "If the return type of the operation is X, do Y."

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