[w3c/clipboard-apis] What is PresentationStyle? (#159)

I'm working on adding a bit more detail about the `ClipboardItem` interface in https://github.com/w3c/clipboard-apis/pull/158. This question came up in the PR review and I wasn't sure what the purpose of  `presentationStyle` member is in `ClipboardItem` that has `unspecified`, `inline` & `attachment` values. I don't see it being used in Chromium async clipboard API implementation, but I do see Safari using it for something that I don't quite understand. Can someone describe the scenario where it's being used and the description of this member so I can add it to the spec? @whsieh @rniwa

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https://github.com/w3c/clipboard-apis/issues/159