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

@domenic commented on this pull request.



> +
+  Some platforms may support having more than one [=clipboard item=] at a time on the [=Clipboard=], while other platforms replace the previous [=clipboard item=] with the new one. 
+
+  A [=clipboard item=] has a <dfn>list of representations</dfn>, each <dfn>representation</dfn> with an associated [=mime type=] and <dfn>data</dfn>.
+
+  <p class=note>
+   In the example where the user copies a range of cells from a spreadsheet, it may be represented as an image (image/png), an HTML table (text/html), or plain text (text/plain).
+  </p>
+
+  Each of these [=mime type=]s describe a different [=representation=] of the same [=clipboard item=] at different levels of fidelity and make the [=clipboard item=] more consumable by target applications during paste.
+
+  <p class=note>
+   Making the range of cells available as an image will allow the user to paste the cells into a photo editing app, while the text/plain format can be used by text editor apps.
+  </p>
+
+  A [=clipboard item=] can also optionally have a <dfn>presentation style</dfn> that helps distinguish whether apps "pasting" a [=clipboard item=] should insert the contents of an appropriate [=representation=] inline at the point of paste or if it should be treated as an attachment.

Although your point about being more precise on the definition makes sense, I'll note that

> multiple terms for "presentation style" with and without space and capital/non-capital letters.

is correct. I.e., the spec needs to define the "presentation style" internal slot, and also define the `presentationStyle` IDL attribute and its getter steps.

Also, the current definition is good in that it explains what the "presentation style" internal slot actually does. Without that it'd be spec-conforming to implement presentation style but never pass it to the operation system or native apps.

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