Hi Mike,

Thanks. Please see the inline response.

Nan

On Wed, Nov 6, 2024 at 9:24 AM Mike Taylor <miketa...@chromium.org> wrote:

>
> On 11/5/24 5:10 PM, Nan Lin wrote:
>
> Hi Mike,
>
> Thanks for the quick response. Please see the inline response.
>
> Thanks,
> Nan
>
> On Tue, Nov 5, 2024 at 4:36 PM Mike Taylor <miketa...@chromium.org> wrote:
>
>> On 11/5/24 3:30 PM, 'Akash Nadan' via blink-dev wrote:
>>
>> Contact emails
>>
>> akashna...@google.com, lin...@chromium.org, johni...@chromium.org
>>
>> Explainer
>>
>> Attribution Reporting with event-level reports
>> <https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md>
>>
>> Attribution Reporting API with Aggregatable Reports
>> <https://github.com/WICG/attribution-reporting-api/blob/main/AGGREGATE.md>
>>
>> Aggregation Service for the Attribution Reporting API
>> <https://github.com/WICG/attribution-reporting-api/blob/main/AGGREGATION_SERVICE_TEE.md>
>>
>> Specification
>>
>> https://wicg.github.io/attribution-reporting-api/
>>
>> Blink component
>>
>> Internals > AttributionReporting
>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Internals%3EAttributionReporting>
>>
>> TAG review
>>
>> Still under review <https://github.com/w3ctag/design-reviews/issues/724>
>> under the original I2S for the Attribution Reporting API
>>
>> TAG review status
>>
>> Pending
>>
>> Summary
>>
>> We are landing the following change to the Attribution Reporting API
>> focused on:
>>
>>    -
>>
>>    making it easier to receive API cookie-based debug reports
>>
>>
>> Currently the API allows cookie-based debug reporting only if third-party
>> cookies are available AND the API caller sets the special unpartitioned
>> ar_debug cookie.
>>
>> This change makes it easier for API callers to use the API’s cookie-based
>> debug reporting by allowing them to receive cookie-based debug reports as
>> long as they have third-party cookie accessibility on the
>> source/destination sites, and they no longer need to actually set the
>> ar_debug cookie. Third-party cookie accessibility is equivalent to the API
>> caller’s ability to set the ar_debug cookie.
>>
>> This change makes it easier for API callers to receive cookie-based API
>> debug reports (i.e. lower chance of misconfigured ar_debug cookies).
>>
>> Explainer/Spec changes
>>
>>    1.
>>
>>    Explainer & Spec:
>>    https://github.com/WICG/attribution-reporting-api/issues/1440
>>
>> Can you motivate this change a little more? I'm not seeing developer
>> feedback in this issue that requiring the ar_debug cookie is a burden - so
>> why do we want to make this change now?
>>
>
> In the past, we've heard about feedback on missing debug reports due to
> misconfigured ar_debug cookie (e.g.
> https://github.com/WICG/attribution-reporting-api/issues/1195).
> Therefore, our motivation is to improve utility, and in the meanwhile
> bring Attribution Reporting API in alignment with Private Aggregation API
> in terms of debugging behavior.
>
> Thanks - looking at
> https://github.com/WICG/attribution-reporting-api/issues/1195#issuecomment-2018709555
> it seems like the developer just misconfigured the debug cookie, right?
>
> So I guess my question is: why did we think requiring this cookie was a
> good idea in the past, and why do we not believe that now? I agree it is
> awkward that ARA and PAA don't have similar debug requirements.
>
Yes, the developer misconfigured the debug cookie and therefore didn't get
debug reporting to work. We've also heard similar feedback on misconfigured
debug cookies.

The purpose of the ar_debug cookie requirement was to make it very clear
that cookie-based debug reporting is tied to whether the reporting origin
has access to unpartitioned cookies, but it's not really improving privacy.
Removing the requirement would allow us to bring ARA in alignment with PAA,
and also make it easier for reporting origins to set up cookie-based debug
reporting while not regressing privacy.
Therefore, we think it's fine to remove the requirement for those reasons
and base debug reporting on whether reporting origins have the capability
to access third-party cookies.



>> Risks
>> Interoperability and Compatibility
>>
>> This is not a fully backwards compatible change. The API caller may
>> receive more debug reports overall, however this is unlikely because the
>> API caller can only set the unpartitioned cookie if they have third-party
>> cookie access and they still have control over whether to enable
>> cookie-based debug reporting via setting other API fields. Additionally,
>> this change will not break any pre-existing API integrations or web
>> functionality.
>>
>> Gecko: No signal (Original request:
>> https://github.com/mozilla/standards-positions/issues/791)
>>
>> WebKit: No signal (Original request:
>> https://github.com/WebKit/standards-positions/issues/180)
>>
>>
>> WebView application risks
>>
>> Does this intent deprecate or change behavior of existing APIs, such that
>> it has potentially high risk for Android WebView-based applications?
>>
>> No
>>
>>
>> Will this feature be supported on all six Blink platforms (Windows, Mac,
>> Linux, Chrome OS, Android, and Android WebView)?
>>
>> The attribution reporting feature will be supported on all platforms with
>> the exception of Android WebView
>>
>> Is this feature fully tested by web-platform-tests
>> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
>> ?
>>
>> Yes
>>
>> Estimated milestones
>>
>> This feature is anticipated to ship as part of Chrome 132
>> <https://chromiumdash.appspot.com/schedule>.
>>
>> Link to entry on the Chrome Platform Status
>>
>> https://chromestatus.com/feature/5107034180288512
>>
>> Links to previous Intent discussions
>>
>> Previous I2S:
>>
>> Intent to Ship: Attribution Reporting API
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/2Rmj5V6FSaY>
>>
>> Intent to Ship: Attribution Reporting features M117
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/nWF61c8xu-M/m/uMmH1ewcAQAJ>
>>
>> Intent to Ship: Attribution Reporting features M118
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/Mh-mJiyJZFk/m/HlgzpphYBQAJ>
>>
>> Intent to Ship: Attribution Reporting features M119
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/6e44SBtEtcQ>
>>
>> Intent to Ship: Attribution Reporting features M120
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/jSk3xpNPzGQ/m/VZPsdYgGCAAJ>
>>
>> Intent to Ship: Attribution Reporting features M121
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/g9KiC6Rg_mA/m/V679WcWuAQAJ>
>>
>> Intent to Ship: Attribution Reporting features M123
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/NE7VGke1Bjc/m/bIX00t4CAAAJ>
>>
>> Intent to Ship: Attribution Reporting features M124
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/aregp1li6xk/m/IhBB2z8tBQAJ>
>>
>> Intent to Ship: Attribution Reporting features M125
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/9UyhI6SRyxM/m/zgWWckgWAQAJ>
>>
>> Intent to Ship: Attribution Reporting features M126
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/7UQR2lPn5KE/m/q_kL6ZiJDgAJ>
>>
>> Intent to Ship: Attribution Reporting features M127
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/LAgnyPsJyJg?pli=1>
>>
>> Intent to Ship: Attribution Reporting features M128 (1)
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/qlsv7fn0zRE/m/SK8upePCCAAJ>
>>
>> Intent to Ship: Attribution Reporting features M128 (2)
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/VKGn41wMYlg/m/VsNXktqvCAAJ>
>>
>> Intent to Ship: Attribution Reporting feature M130
>> <https://groups.google.com/a/chromium.org/g/blink-dev/c/-K2xDYuvmmA/m/Fhp564I7AgAJ>
>>
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