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

@domenic commented on this pull request.



> +
+   1. For each |representation| in |itemTypeList|:
+
+    1. If |representation|'s [=representation/MIME type=] is |mimeType|, then:
+
+     1. Let |p1| be the |representation|'s [=representation/data=].
+
+      1. [=promise/React=] to |p1|:
+
+       1. If |p1| was fulfilled with value |v|, then:
+
+        1. If |v| is a {{DOMString}}, then follow the below steps:
+
+         1. Let |v1| be the result of [=/encoding=] |v|.
+
+         1. Let |blobData| be a [=Blob=] created using |v1| with its {{Blob/type}} set to |mimeType|, [=serialize a MIME type|serialized=].

There is unfortunately no good rigorous way to create `Blob`s, due to their spec not being very rigorous (e.g. not having proper internal slots for things like type). I think @snianu's text here is as good as it can be given the current state of the File API spec. I'm not sure what the ` {type: |serializedMimeType|}` notation you're suggesting means.

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