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
   

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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