Re: [whatwg/dom] Abort controller (#437)

rbuckton commented on this pull request.



> +    });
+  }
+ </pre>
+
+ APIs that require more granular control could extend both {{AbortController}} and {{AbortSignal}}
+ according to their needs.
+</div>
+
+<h3 id=interface-abortcontroller>Interface {{AbortController}}</h3>
+
+<pre class="idl">
+[Constructor(), Exposed=(Window,Worker)]
+interface AbortController {
+  [SameObject] readonly attribute AbortSignal signal;
+
+  void abort();

@jyasskin The result of `cancel()` in prex is to observe any errors thrown in the registered callback (or here, the onabort event), and respond accordingly. In prex, registered callbacks are not evaluated immediately and as a result the only way to observe the exception is through a Promise. A Promise return wouldn't strictly be necessary if `cancel()` ran to completion synchronously. 

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