Re: [w3ctag/design-reviews] Async Clipboard - image/delayed content (#350)

For images, because the encoder/decoder that Chrome uses (Skia), and existing sanitization, can only guarantee the sanitization of raster information, only raster information is preserved. Non-raster information, therefore, is tossed out. This is consistent with the level of preservation for image metadata offered in other [clipboard APIs](https://w3c.github.io/clipboard-apis/), and the [ImageBitmap](https://developer.mozilla.org/en-US/docs/Web/API/ImageBitmap) API.

However, the specification should not prevent implementers from deciding whether they choose to preserve non-raster information, as long as they can ensure it's secure.

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