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

jyasskin commented on this pull request.



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

[SameObject], right?

> +[Exposed=(Window,Worker)]
+interface CancellationSignal : EventTarget {
+  readonly attribute boolean cancelled;
+
+  attribute EventHandler oncancel;
+};
+</pre>
+<dl class=domintro>
+ <dt><code><var>signal</var> . </code>{{CancellationSignal/cancelled}}
+ <dd>Returns true if this {{CancellationSignal}} has been cancelled, and false otherwise.
+</dl>
+
+Each {{CancellationSignal}} has an <dfn for=CancellationSignal>cancelled flag</dfn> which is
+unset unless otherwise specified.
+
+Each {{CancellationSignal}} has an <dfn for=CancellationSignal>cancellation steps</dfn> algorithm

This might need to be passed in through the creation of the CancelattionController. We'll see what works in prose once FetchController is specified using this.

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