Re: [w3c/clipboard-apis] Add clipboard IDL description. (#158)

@mbrodesser commented on this pull request.



>  
    1. Run the following steps [=in parallel=]:
 
-    1. Let |r| be the result of running [=check clipboard read permission=] [=in parallel=]
+    1. Let |r| be the result of running [=check clipboard read permission=].
+
+     Note: Clipboard permission is not supported on Safari. However, the read() method must be called inside
+     a user gesture event and the user must select the paste option from the native context menu that pops up
+     when read() is called from JS, otherwise, the promise will be rejected.
+
+    1. If |r| is false, then:
+    
+     1. [=Queue a global task=] on the [=permission task source=], given |realm|'s [=Realm/global object=], to [=reject=] |p| with {{"NotAllowedError"}} DOMException in |realm|.

TBH "permission task source" and why it's needed is unclear to me. Its 'definition', https://w3c.github.io/permissions/#dfn-permissions-task-source, isn't really one. @domenic could you please shed some light on this?

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