Intent to Extend Experiment: Cookie Deprecation Label

[John Delaney]

Contact emails

john...@chromium.org, wande...@chromium.org, lin...@chromium.org

Explainer

https://github.com/privacysandbox/tpcd-labeling/blob/main/cookie_deprecation_labeling_explainer.md

https://developer.chrome.com/en/docs/privacy-sandbox/chrome-testing

Summary

As noted on the I2D&R for Third Party Cookies:

We recently announced a new path focused on elevating user choice, instead of third-party cookie deprecation. We will continue to support and invest in the Privacy Sandbox technologies. While we can't predict what exact user preferences will be, it’s important for businesses and developers to prepare for a likely increase in Chrome browsers without support for third-party cookies, and to continue investing in privacy-enhancing technologies.

The cookie deprecation labels are useful for developers to evaluate and optimize deployments of the Privacy Sandbox APIs prior to any changes in the number of browsers which support third-party cookies, so we are asking to extend the current set of labels for three more milestones.

Link to “Intent to Experiment” blink-dev discussion

https://groups.google.com/a/chromium.org/g/blink-dev/c/3escBQGtIpM/m/ntcytva5BgAJ

https://groups.google.com/u/1/a/chromium.org/g/blink-dev/c/v3PiIzm1M-Y

 

Goals for experimentation

Continued deployment and evaluation of Privacy Sandbox Ads APIs.

Experimental timeline

This feature was previously approved to run up until Chrome 129.

We would like to extend this for Chrome 130 through 132. 

Any risks when the experiment finishes?

Minimal, the cookie deprecation labels are only available for a subset of users and must be requested. 

Reason this experiment is being extended

We have received feedback that these labels are useful for ad tech companies to evaluate and optimize the APIs in preparation for changes to third party cookie availability.

Ongoing technical constraints

None

Will this feature be supported on all five Blink platforms supported by Origin Trials (Windows, Mac, Linux, Chrome OS, and Android)?

No, not supported on webview.

Link to entry on the feature dashboard

https://chromestatus.com/feature/5189079788683264

[Mike Taylor]

Hey John,

Can you confirm these labels will only be sent to the 1% "Mode B" population, until the new user choice approach is shipped? Or is something else planned?

thx,
Mike

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[John Delaney]

Hey Mike,

We also plan to continue sending labels for the "label_only" groups as well, overall this <8.5% of browsers (these labels are also subject to a number of eligibility requirements). 

Currently we plan to continue extending this until the new approach is shipped, but we will provide any updates on future I2EEs.

[Mike Taylor]

OK - thanks John. LGTM to extend until 132 inclusive.