Re: [w3ctag/design-reviews] COEP reflection (Issue #742)

Hi there, Zheng from Google Ad Manger. 

We would like to support COEP enabled publisher to continue monetizing their sites where ads are currently broken (unless participated in the reverse OT). We want to be able to know if COEP is enabled and use anonymous iframe as an alternative. Currently there isn't a way to accurately identify COEP traffic. I can see the proposal discussed there to be very useful for this purpose.

Regarding those alternatives:

1. Marking iframe as anonymous would result in the ad iframe have no access to existing cookies or shared storage. This will have a significant consequences in terms of ad performance. It is not something we want to do unconditionally. 
2. The polyfill will impose unnecessary latency and resource cost to the user. 
3. This is an _acceptable_ alternative if the proposed reflection is rejected. The consequences is that ads on publisher sites that use COEP but COOP will be broken.
4. In practice, we try not to make the publisher to retag or explicitly expose the config of their site to the ads script if not absolute necessary.


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