Re: [whatwg/dom] AbortController, AbortSignal, and garbage collection (#920)

On a slightly unrelated note: what **is** missing here is if the *followingSignal* is aborted separately (i.e. through its own abort controller, not as a result of the *parentSignal* becoming aborted). In that case, the *followingSignal* should remove the abort steps it had attached to its *parentSignal*, so that the *parentSignal* does not keep the *followingSignal* alive unnecessarily.

I don't think this shouldn't be too difficult to fix in the specification. I'll give it a try.

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