Re: [whatwg/dom] Mark dependent abort signals as aborted before firing events (PR #1295)

I just came across this after looking into the AbortSignal algorithms while working on Observables, and I don't understand this part:

> Dependent signals do not themselves have dependent signals, which means it's unnecessary to recursively call "signal abort"

Why is this true? In Observables, we were using dependent `AbortSignal`s for a while, for each signal that was used to subscribe to upstream Observables, and I believe we were able to create a long chain of `AbortSignal` dependencies such that aborting some initial signal led to the recursive invocation of (old version of) the "**signal abort**" algorithm, on a whole deep chain of signals. Why does this PR say that is not possible?

Note: We are no longer chaining dependent signals like this in Observables, because the timing of aborting parent signals before dependents did not work for us (https://github.com/WICG/observable/pull/154), but still I think it is very possible to do, no?

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