Re: [w3c/ServiceWorker] Clarify target object of Client.postMessage can be null (#1274)

jakearchibald commented on this pull request.



> @@ -1028,7 +1028,7 @@ spec: webappsec-referrer-policy; urlPrefix: https://w3c.github.io/webappsec-refe
       The <dfn method for="Client"><code>postMessage(|message|, |transfer|)</code></dfn> method *must* run these steps:
 
         1. Let |sourceSettings| be the <a>context object</a>'s <a>relevant settings object</a>.
-        1. Let |destination| be the {{ServiceWorkerContainer}} object whose [=ServiceWorkerContainer/service worker client=] is the <a>context object</a>'s [=Client/service worker client=].
+        1. Let |destination| be the {{ServiceWorkerContainer}} object whose [=ServiceWorkerContainer/service worker client=] is the <a>context object</a>'s [=Client/service worker client=], if any; otherwise let it be null.

I think ", or null if no match is found" would be clearer.

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