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

@snianu commented on this pull request.



> +  Issue: Add definition to clarify what {{ClipboardItem/createDelayed()}} method does. From the discussions it looks like a Windows/Mac only feature where the
+  platform supports writing of the data to the system clipboard in a delayed fashion so the system clipboard can request data on-demand.
+  See https://docs.microsoft.com/en-us/windows/win32/dataxchg/clipboard-operations#delayed-rendering
+
+  <h4 attribute for=ClipboardItem lt=presentationStyle>presentationStyle</h4>
+  <p>It is an <a href=https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#enumerated-attribute>enumerated attribute</a> whose keywords are the <code>string</code>, <code>unspecified</code>, <code>inline</code> and <code>attachment</code>.
+  
+  Note: {{ClipboardItem/presentationStyle}} helps distinguish between "inline" data(e.g. selecting text on a web page and copying), vs. file-like data (e.g. copying a plain text file).
+      This difference is used to provide a hint when writing to the system pasteboard on iOS/iPadOS. This allows apps like Notes to insert a file attachment when copying a plain text file from the Files app, but insert text inline when
+      copying a selected piece of plain text from another app. In both cases, the MIME type in the pasteboard would be text/plain. This is used for both reading and writing.
+  </p>
+
+  <p>{{ClipboardItem/presentationStyle}} getter steps are to return [=this=]'s {{ClipboardItem/presentationStyle}}</p>
+
+  Issue: Currently {{ClipboardItem/lastModified}} is not supported in Chromium and Safari, Should we remove it?
+

Done.

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