On Tuesday, March 11, 2025 at 12:08:50 PM UTC-4 Mike Taylor wrote:

On 3/11/25 9:52 AM, Andrew Liu wrote:

On Monday, March 10, 2025 at 5:16:00 PM UTC-4 Mike Taylor wrote:

On 3/3/25 10:32 AM, Andrew Liu wrote:

Done, requested reviews.

On Sunday, March 2, 2025 at 9:35:30 PM UTC-5 Domenic Denicola wrote:

Can you request Privacy, WP Security, Enterprise, Debuggability, and 
Testing review gates in ChromeStatus?

On Friday, February 28, 2025 at 7:45:44 AM UTC+9 Andrew Liu wrote:

Fixed the link in chromestatus, thanks.

On Thursday, February 27, 2025 at 5:02:41 PM UTC-5 Mike Taylor wrote:

On 2/27/25 3:46 PM, Chromestatus wrote:

Contact emails l...@chromium.org, ort...@chromium.org, sv...@chromium.org, 
rtarp...@chromium.org 

Explainer https://github.com/privacycg/nav-tracking-mitigations/issues
/41#issuecomment-2504329542 

Specification https://privacycg.github.io/nav-tracking-mitigations/#bounce
-tracking-mitigations

Can you point out which section covers the stateless bounce tracking? It's 
not obvious to me.

The stateless modifications are in this pull request: https://github.com/
privacycg/nav-tracking-mitigations/pull/95. ChromeStatus mentioned I should 
prefer the published spec link over unmerged PRs; would you recommend I use 
the PR link instead in this case? 

Thank you. My personal opinion is that an unmerged PR is more useful in the 
chromestatus entry than a link to a spec that is missing the relevant 
proposed changes. But, even better is merging the PR and linking to the 
spec. So, what is preventing us from doing that in this case?

I don't have permissions in the repo to merge the PR. I formally became a 
spec editor a week ago, but GH permission changes have to go through the 
PrivacyCG chairs. The previous editors have requested that new editors 
(e.g. me) merge any future PRs. So at this point I'm blocked (until their 
next meeting, which is on Thursday, I suspect). I've switched the 
ChromeStatus field to point to the PR in the meantime. I'll switch it back 
once the PR is merged.





Summary 

Bounce tracking mitigations for the HTTP cache is an extension to existing 
anti-bounce-tracking behavior. It removes the requirement that a suspected 
tracking site must have performed storage access in order to activate 
bounce tracking mitigations. Chrome's initially proposed bounce tracking 
mitigation solution triggers when a site accesses browser storage (e.g. 
cookies) during a redirect flow. However, bounce trackers can 
systematically circumvent such mitigations by using the HTTP cache to 
preserve data. By relaxing the triggering conditions for bounce tracking 
mitigations, the browser should be able to catch bounce trackers using the 
HTTP cache.


Blink component Privacy>NavTracking 
<https://issues.chromium.org/issues?q=customfield1222907:%22Privacy%3ENavTracking%22>
 

TAG review https://github.com/w3ctag/design-reviews/issues/862

It looks like https://github.com/w3ctag/design-reviews/issues/1062 is the 
correct link.



TAG review status Not applicable 

Risks 


Interoperability and Compatibility 

None


*Gecko*: Positive (https://github.com/mozilla/standards-positions/issues/835) 


What is the difference between 835 and https://github.com/mozilla/sta
ndards-positions/issues/1186? Is 1186 supposed to cover this particular 
change (not requiring storage access / considering the HTTP cache)? If so, 
could it be edited to reflect that?

Yeah, 1186 was opened to highlight the stateless changes. Edited the 
ChromeStatus entry. 



*WebKit*: No signal (https://github.com/WebKit/sta
ndards-positions/issues/214) 

Could we add a comment to this old issue informing them of this proposed 
change?

Done. 



*Web developers*: No signals 

*Other signals*: 

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?

None


Debuggability 

There exists a section in Chrome devtools to try out bounce tracking 
mitigations (see link for context). It currently checks for the current 
(stateful) behavior and will be updated after the fact. Progress for 
devtools parity is tracked in https://crbug.com/399681359. 
https://developer.chrome.com/blog/bounce-tracking-mitigation
s-dev-trial#how_can_i_tell_if_my_site_is_impacted


Will this feature be supported on all six Blink platforms (Windows, Mac, 
Linux, ChromeOS, Android, and Android WebView)? No 

This feature is supported on all platforms except WebView.


Is this feature fully tested by web-platform-tests 
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
? Yes 

https://wpt.fyi/results/nav-tracking-mitigations?label=maste
r&label=experimental&aligned&q=nav-tracking-mitigations


Flag name on about://flags None 

Finch feature name DIPS 

Requires code in //chrome? False 

Tracking bug https://crbug.com/40264244 

Launch bug https://launch.corp.google.com/launch/4354304 

Estimated milestones Shipping on desktop 134 

Anticipated spec changes 

Open questions about a feature may be a source of future web compat or 
interop issues. Please list open issues (e.g. links to known github issues 
in the project for the feature specification) whose resolution may 
introduce web compat/interop risk (e.g., changing to naming or structure of 
the API in a non-backward-compatible way).
https://github.com/privacycg/nav-tracking-mitigations/pull/95 

Link to entry on the Chrome Platform Status https://chromestatus.com/featu
re/6299570819301376?gate=5206396818423808 

Links to previous Intent discussions Intent to Prototype: 
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/6
7644489.2b0a0220.30ecd.0256.GAE%40google.com 


This intent message was generated by Chrome Platform Status 
<https://chromestatus.com>. 

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