sharedStorage API unavailable on some devices regardless of tpc-phase-out-facilitated-testing

[zapo]

Hello we're working with sharedStorage API and we have noticed on some devices that that the API is unavailable eventhough some other PS APIs are available (eg navigator.joinAdInterestGroup) regardless the label used for tpc-phase-out-facilitated-testing, including the force treatment label.

For those window.sharedStorage is undefined and can only be turned back on by using --enable-privacy-sandbox-ads-apis=true flag.

If this is expected (due to experiment groups?) and if so is there a documentation describing the proportion of devices having a partial set of APIs enabled?

[zapo]

For what it's worth we are experiencing similar issues with navigator.cookieDeprecationLabel, on some device getValue returns a promise that never resolves, and others navigator.cookieDeprecationLabel is undefined or resolves to empty string, while they have the force treatment label. This seems to be a new behavior since upgrading to Chrome 130.

I can file separately if unrelated.

EDIT: cookieDeprecationLabel DOES resolve sorry ... I was using console logging to debug and didn't realize I had a remnant filter 🤦

[bjoberg]

Hi @zapo I am actually running into a similar issue: #429.

What was your remnant filter and how did you get the cookieDeprecationLabel to resolve?

[zapo]

@bjoberg I forgot I was using a console logging filter and was inspecting the promise result using console.log. The absence of log output lead me to think the then handler was never called like in following screenshot.

It's unrelated to the original issue and a debugging mistake. In your ticket the promise does resolves as well but seem to resolve to empty string.

[johnivdel]

Hi @zapo, would you be able to paste the contents of chrome://version?

For a small set of users, we expect there to be only a subset of APIs supported; see the footnote 1 on this Privacy Sandbox blog.

Roughly 1% of users will have the other APIs available without Shared Storage.

Let me know if you have any further questions or if the above was unclear, thanks!

[bmilekic]

@johnivdel Here's my chrome://version output -- note that I'm a colleague of @zapo and the one with the Chrome instance that appears to have Shared Storage off by default, but the other PS APIs seemingly on.

Google Chrome	130.0.6723.92 (Official Build) (arm64) 
Revision	ef4f16c57010eb3e047ef101019b869296173bd9-refs/branch-heads/6723@{#1518}
OS	macOS Version 15.0.1 (Build 24A348)
JavaScript	V8 13.0.245.18
User Agent	Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36
Command Line	/Applications/Google Chrome.app/Contents/MacOS/Google Chrome --restart --restart --flag-switches-begin --privacy-sandbox-enrollment-overrides=https://spangled-lead-muskmelon.glitch.me --flag-switches-end
Executable Path	/Applications/Google Chrome.app/Contents/MacOS/Google Chrome
Profile Path	/Users/bmilekic/Library/Application Support/Google/Chrome/Default
Linker	lld
Active Variations	853552cb-ef4fd7e3
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[jkarlin]

Thanks @bmilekic, I can confirm that you're part of the 1% shared storage holdback experiment.

[zapo]

Thanks @johnivdel and @jkarlin I'm not very familiar with how the experiments are pushed on browser instances. Is it tied to chrome profile / user identity?
For this particular browser instance / experiment, can you confirm that running with --enable-privacy-sandbox-ads-apis=true is the way to go to force enable shared storage?

[johnivdel]

There are a few options:

• You can run with --reset-variation-state which will put you in new experiments where you are likely to no longer be in the holdback group
• You can run with --enable-features=SharedStorageAPI

Let me know in the event these do not work, thanks!