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

@domenic commented on this pull request.



> @@ -5740,6 +5878,152 @@ for="value-with-size">value</dfn> and <dfn for="value-with-size">size</dfn>.
  1. Set |container|.\[[queueTotalSize]] to 0.
 </div>
 
+<h3 id="transferrable-streams">Transferable streams</h3>
+
+Transferable streams are implemented using a special kind of identity transform which has the
+[=writable side=] in one realm and the [=readable side=] in another realm. The following abstract
+operations are used to implement these "cross-realm transforms".
+
+<div algorithm>
+ <dfn abstract-op lt="PackAndPostMessage">PackAndPostMessage(|port|, |type|, |value|)</dfn> performs
+ the following steps:
+
+ 1. Let |message| be [$OrdinaryObjectCreate$](null).

Everything returns a completion record: https://tc39.es/ecma262/#sec-implicit-completion-values

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