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

> WebKit would not support arbitrary types across origins? What is the concern there given it's opt-in from all sides?

So in shipping Safari, our DataTransfer APIs don't allow for cross-origin transfer of custom data types, since this could be abused as a potential tracking mechanism. With the async clipboard API, we currently uphold these same rules for the same reasons (as well as consistency with the legacy API).

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