Re: [heycam/webidl] Propagate active script to callbacks (#902)

Hmm, now I am worried about the case where the topmost script-having execution context is null. In that case we still need to capture the incumbent settings object as per the backup stack.

I think this could still be done, but we would have to convert the backup incumbent settings object stack into a backup incumbent _execution context_ stack.

That is a larger change. So I would prefer to land this plus whatwg/html#5722 first using the mechanism from this PR, i.e. an (incumbent settings object, active script) tuple. Then I can follow up with a refactoring to consolidate everything to use execution contexts.

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