Re: [whatwg/dom] Define a 'PromiseController' and 'PromiseSignal' interface. (#434)

annevk commented on this pull request.



> +  readonly attribute boolean aborted;
+
+  attribute EventHandler onabort;
+};
+</pre>
+<dl class=domintro>
+ <dt><code><var>signal</var> . </code>{{PromiseSignal/aborted}}
+ <dd>Returns true if this {{PromiseSignal}} has been aborted, and false otherwise.
+</dl>
+
+Each {{PromiseSignal}} has an <dfn for=PromiseSignal>aborted flag</dfn> which is unset unless
+otherwise specified.
+
+Each {{PromiseSignal}} has an <dfn for=PromiseSignal>abort steps</dfn> algorithm which is
+executed when its [=PromiseSignal/aborted flag=] is set. Unless otherwise specified, this
+algorithm is a no-op.

But maybe you're right that we should design this more so that it even works for all scenarios when not subclassed. I do think that whatever this get passed to needs to be able to hook into it, since we don't really have specification-only event listeners (I think that would be a bigger thing to add).

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