Re: [w3c/clipboard-apis] Arbitrary clipboard types (Issue #165)

> So in shipping Safari, our DataTransfer APIs don't allow for cross-origin transfer of custom data types

This is currently supported by both Chrome and Firefox.
e.g. 
For copying a custom type, open this page: https://jsfiddle.net/uLz7s4h3/. Select some text in "Some Text" and press Ctrl + C.
Result:
Chrome creates "Chromium Web Custom MIME Data Format" on Windows
Firefox creates "application/x-moz-custom-clipdata" on Windows

For Paste open this page: https://sphenoid-hurricane-hovercraft.glitch.me/
click in "Some Text" and press Ctrl + V.
Result:
The text "This text was copied using DT APIs" will be inserted into the Div element.

Both Chrome and Firefox support copying and pasting content from custom types(and unsanitized HTML content) across origins using the DataTransfer APIs. This is why we want to align async APIs with the DataTransfer APIs. 

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