Hi Mike,

If a site continues to set the ar_debug cookie, they will still be able to 
get the expected debug reporting. They do not need to stop setting it.

Thanks,
Akash

On Wednesday, November 6, 2024 at 12:25:41 PM UTC-8 Mike Taylor wrote:

>
> On 11/6/24 1:28 PM, Nan Lin wrote:
>
> Hi Mike,
>
> Thanks. Please see the inline response.
>
> Nan
>
> On Wed, Nov 6, 2024 at 9:24 AM Mike Taylor <mike...@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 <mike...@chromium.org> wrote:
>>
>>> On 11/5/24 3:30 PM, 'Akash Nadan' via blink-dev wrote:
>>>
>>> Contact emails 
>>>
>>> akash...@google.com, lin...@chromium.org, john...@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.
>
> OK - thanks for the responses. One more question: if sites continue to 
> send the ar_debug cookie, will they still get the expected debug reporting? 
> Or will they need to stop sending it?
>
>
>
>
>>> 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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>>

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