Re: [whatwg/streams] Support transferable streams (postMessage) (#1053)

@ricea commented on this pull request.



> +  <p>The transferred stream can be used exactly like the original. The original will become locked
+  and no longer directly usable.
+ </dd>
+</dl>
+
+<div algorithm="TransformStream transfer steps">
+{{TransformStream}} objects are [=transferable objects=]. Their [=transfer steps=], given |value|
+and |dataHolder|, are:
+
+<!-- Find a way to linkify ReadableStream transfer steps and WritableStream transfer steps -->
+
+ 1. If ! [$IsReadableStreamLocked$](|value|.\[[readable]]) is true, throw a "{{DataCloneError}}"
+    {{DOMException}}.
+ 1. If ! [$IsWritableStreamLocked$](|value|.\[[writable]]) is true, throw a "{{DataCloneError}}"
+    {{DOMException}}.
+ 1. Perform {{ReadableStream}} transfer steps with |value|.\[[readable]] and |readableDataHolder|.

Done.

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