Hey Nan,
On 1/24/25 6:29 PM, Nan Lin wrote:
Contact emails
lin...@chromium.org <mailto:lin...@chromium.org>,
wanderv...@chromium.org <mailto:wanderv...@chromium.org>
Explainer
https://github.com/privacysandbox/tpcd-labeling/blob/main/cookie_deprecation_labeling_explainer.md
<https://github.com/privacysandbox/tpcd-labeling/blob/main/cookie_deprecation_labeling_explainer.md>
https://developer.chrome.com/en/docs/privacy-sandbox/chrome-testing
<https://developer.chrome.com/en/docs/privacy-sandbox/chrome-testing>
Summary
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
<https://developers.google.com/privacy-sandbox/relevance/setup/web/chrome-facilitated-testing>for
three more milestones.
This is a non-standard experiment, so the areas to demonstrate progress
in https://www.chromium.org/blink/launching-features/#origin-trials
don't cleanly apply. That said, have you received any useful feedback
from developers who are using these labels?
Also, when do you expect this experiment to outlive it's usefulness?
Storage Access Headers
<https://groups.google.com/a/chromium.org/g/blink-dev/c/gERgwZfN_-E>will
ship in M133, allowing developers to determine if they have access to
unpartitioned cookies via the Sec-Fetch-Storage-Access header instead
of labels. Extending this experiment gives time for developers to make
use of this upcoming API as a signal for cookie access.
My understanding of this experiment was to allow for A/B testing
analysis - but it sounds like it can be replaced with a signal of "has
3P cookies" (like navigator.cookieEnabled). Does that fully satisfy the
needs of developers trying to understand PS APIs? Or do I misunderstand?
Link to “Intent to Experiment” blink-dev discussion
https://groups.google.com/a/chromium.org/g/blink-dev/c/0_dR-ffA2LA/m/ZgmMhK-XAQAJ
<https://groups.google.com/a/chromium.org/g/blink-dev/c/0_dR-ffA2LA/m/ZgmMhK-XAQAJ>
https://groups.google.com/a/chromium.org/g/blink-dev/c/3escBQGtIpM/m/ntcytva5BgAJ
<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
<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 132.
We would like to extend this for Chrome 133 through 135, inclusive.
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
<https://chromestatus.com/feature/5189079788683264>
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