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

@mbrodesser commented on this pull request.



>  
-    Promise<Blob> getType(DOMString type);
-  };
+   dictionary ClipboardItemOptions {
+   PresentationStyle presentationStyle = "unspecified";
+   };
+  </pre>
+  <p><dfn export for=ClipboardItem id=concept-clipboard-item>ClipboardItem</dfn></p>
+  The [=ClipboardItem=] object has MIME types that are in the {{ClipboardItem/types}} list, and [=Blob=]s corresponding to the {{ClipboardItem/types}}.
+  It has a mapping of the MIME types in {{DOMString}} format and a [=Blob=] corresponding to the MIME types that contains the actual payload.
+  There can be multiple [=ClipboardItem=]s as each [=ClipboardItem=] represents contents of a clipboard, and there can be multiple clipboards supported on a platform such as iOS/iPadOS.

> it looks like we could create multiple pasteboards using the create methods defined in Creating and Releasing a Pasteboard section.

Yes, interface-wise, that seems possible. However, that seems to not match the use case described at https://github.com/w3c/clipboard-apis/issues/93#issuecomment-853727779. 

> For each pasteboard, we could add multiple pasteboard items using NSPasteboardType. 

As mentioned above, that doesn't match the above mentioned use case. A `NSPasteBoard` may contain multiple pasteboard items, see https://developer.apple.com/documentation/appkit/nspasteboard/1529995-pasteboarditems?language=objc. That seems to match the use case. @rniwa 

> So, I think multiple clipboards is applicable to both Linux and macOS.

Apple's above mentioned use case wouldn't work on Linux, because there, a clipboard may contain only at most one item with multiple representations.

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