LGTM to extend from 127 to 129 inclusive.
On 7/15/24 11:56 AM, John Delaney wrote:
*Contact emails*
johni...@chromium.org, wanderv...@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*
With the end of Chrome-facilitated testing period, we will continue to
expose cookie deprecation labels within Chrome to facilitate
evaluation of the Privacy Sandbox Relevance and Measurement APIs by
ad-techs until sometime during the third-party cookie phase-out
process in 2025. Third-party cookie phase-out is subject to addressing
any remaining concerns of the UK Competition and Markets Authority (CMA).
We will be extending the current set of labels, documented on the
developer blog
(https://developers.google.com/privacy-sandbox/relevance/setup/web/chrome-facilitated-testing).
We are still evaluating possible changes to the labeling configuration
in this period between facilitated testing and third-party cookie
phase-out. Further guidance will be provided in the coming milestones
on any changes to labels.
We expect to support labeled browser groups until we begin phasing out
third-party cookies in early 2025, and for some time during the
phase-out process.
*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*
While the Chrome-facilitated testing period concluded at the end of
H1, we expect ad-techs to continue to use the labels to evaluate and
optimize deployments of the Privacy Sandbox Ads APIs.
*Experimental timeline*
This feature was previously approved to run from Chrome 119 -> 126. We
expect to extend this experiment every 3 milestones (per standard
process) until some point during third-party cookie phaseout.
We would like to start with extending this for Chrome 127 through 129.
*Any risks when the experiment finishes?*
Minimal, the cookie deprecation labels are only available for a subset
of users and must be requested.
We expect to support labeled browser groups for some time during the
third-party cookie phase-out process. In this case, the fraction of
labeled browsers would increase, which was not the case in the
original Intent to Experiment. We will seek approval for this in
subsequent Intent to Extend Experiments, and plan to maintain a
holdback group at those times.
Any changes in usage/availability will be communicated beforehand to
blink-dev.
*Reason this experiment is being extended*
We have received feedback that these labels are useful for ad tech
companies to evaluate the APIs with limited browser groups beyond the
Chrome-facilitated testing period.
*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
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