Re: [w3ctag/design-reviews] Backdrop Filter (#353)

Hi,

@alice, @dbaron, @plinss, and I looked at this today in our Cupertino F2F.

When @alice and I discussed this in our Reykjavík F2F, we filed w3ctag/meetings#31 "How do we balance concerns between interoperability and implementability?" to try to come up with guidance for cases like this. In [a comment on that issue](https://github.com/w3ctag/meetings/issues/31#issuecomment-495164010), Alice laid out several options for such situations, and concluded that the "*best* choice of these[...] will ultimately depend on and should be guided by the potential *end-user* impact, and then following the usual priority of constituencies."

Barring new developments that would make this moot, we think the best way forward at this point would be for the spec to define both models of backdrop filters, and to say that implementations MUST follow one or the other.

We're going to close this review; please file a new one if the situation or API changes significantly.

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