Re: [w3ctag/design-reviews] Early design review request: IPA (Issue #823)

Hi @hadleybeeman, glad to hear that you will be looking at it today! Let me do my best to answer your questions, but please follow up if you need any clarity.

1. We are designing for the use case of measuring the impact of advertising based on cross site behavior. Previously this was supported via shared cross site context (3rd party cookies.) We believe this is an important use case to support in a manner that doesn't enable tracking end-users individually, so that end-users's have access to sites which are ad supported that may otherwise require payment or require end-users to provide PII that can be used for tracking.

2. The Private Advertising Technology Community Group (PATCG), where IPA has been proposed, has published a fairly [comprehensive overview of alternative proposals](https://github.com/patcg/docs-and-reports/tree/main/design-dimensions). I'm not sure I understand the question about "mak[ing] sense from a developer's point of view", but the general goal in the PATCG is to recommend a common standard (IPA or otherwise) which can be standardized and implemented across browsers so that developers have a only one common API that supports this use case.

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