We have a LGTM from Chris in the chromestatus page "API Owners" section 
(see attached screenshot). I think this means we are ok to proceed, but 
please let me know if I am mistaken and we need an explicit LGTM in this 
thread. Thanks! 

On Monday, October 16, 2023 at 11:09:07 AM UTC-7 Lu Huang wrote:

> In this case, I want to make sure there's enough time for app partners to 
> enroll in January when M121 reaches Stable and for us to help them 
> troubleshoot the configuration needed. This feature requires more 
> server-side configuration ( of /.well-known/web-app-origin-association) 
> that could take time to troubleshoot than other web app manifest features 
> in the past. 
>
> If things go well and we get the desired feedback in time, we could try to 
> move forward from OT before the 6 months are up. 
>
> On Monday, October 16, 2023 at 10:32:28 AM UTC-7 sligh...@chromium.org 
> wrote:
>
>> I'm supportive of this, but curious why 6 milestones. If there are 
>> partners signed up to provide feedback, can we summarize that input sooner 
>> than 6 months?
>>
>> Best,
>>
>> Alex
>>
>> On Mon, Oct 16, 2023 at 9:00 AM 'Lu Huang' via blink-dev <
>> blin...@chromium.org> wrote:
>>
>>> Quick update: 
>>> We would like to push the start back to M121, and request that it run 
>>> for 6 milestones initially.
>>> First milestone: 121. 
>>> Last milestone: 126.
>>>
>>> On Thursday, October 12, 2023 at 10:11:29 AM UTC-7 mike...@chromium.org 
>>> wrote:
>>>
>>>> Jason, could you please work with Lu to figure out why he can't post 
>>>> comments in the chromestatus entry (but can request a review)?
>>>>
>>>> thanks.
>>>> On 10/11/23 5:25 PM, 'Lu Huang' via blink-dev wrote:
>>>>
>>>> For the 3 review categories in chromestatus (security, privacy, and 
>>>> debuggability), I have clicked on request review but have not found a way 
>>>> to post comments from the UI.
>>>>
>>>> For security and privacy, we have a self-review at:  
>>>> manifest-incubations/scope_extensions-security-privacy-questionnaire.md 
>>>> at gh-pages · WICG/manifest-incubations (github.com) 
>>>> <https://github.com/WICG/manifest-incubations/blob/gh-pages/scope_extensions-security-privacy-questionnaire.md>
>>>> For debuggability, here are the survey responses until I find out how 
>>>> to add to the comments at chromestatus:
>>>>
>>>> (1) Does the introduction of the new Web Platform feature break Chrome 
>>>> DevTools' existing developer experience? No. (2) Does Chrome DevTools' 
>>>> existing set of tooling features interact with the new Web Platform 
>>>> feature 
>>>> in an expected way? 
>>>> Yes. (3) Would the new Web Platform feature's acceptance and/or 
>>>> adoption benefit from adding a new developer workflow to Chrome DevTools? 
>>>> Yes. 
>>>> If adopted, this new feature would benefit from new UI and tooling in the 
>>>> Application Page of Chrome DevTools. DevTools support can help developers 
>>>> determine if they have set up the web app association configuration 
>>>> correctly and if their specified scope_extensions are valid.
>>>>
>>>> On Wednesday, October 11, 2023 at 2:12:09 PM UTC-7 Lu Huang wrote:
>>>>
>>>>> We would like to start running this experiment from 120 through 123 
>>>>> inclusive, but may have to delay start to 121 running through 124. 
>>>>>
>>>>>
>>>>>
>>>>> On Wednesday, October 11, 2023 at 7:54:51 AM UTC-7 Chris Harrelson 
>>>>> wrote:
>>>>>
>>>>>> Please also fill out the 3 other review categories (security, 
>>>>>> privacy, debuggability) in chromestatus. 
>>>>>>
>>>>>>
>>>>>> On Wed, Oct 11, 2023 at 7:13 AM Mike Taylor <mike...@chromium.org> 
>>>>>> wrote:
>>>>>>
>>>>>>> Hi there,
>>>>>>>
>>>>>>> Could you clarify which milestones you would like to run the 
>>>>>>> experiment on?
>>>>>>>
>>>>>>> thanks,
>>>>>>> Mike
>>>>>>> On 10/11/23 6:05 AM, 'Lu Huang' via blink-dev wrote:
>>>>>>>
>>>>>>> Contact emails 
>>>>>>> lu...@microsoft.com, luig...@microsoft.com, alanc...@chromium.org
>>>>>>>
>>>>>>> Explainer
>>>>>>>
>>>>>>> https://github.com/WICG/manifest-incubations/blob/gh-pages/scope_extensions-explainer.md
>>>>>>>
>>>>>>> Specification
>>>>>>> None
>>>>>>>
>>>>>>> Design docs
>>>>>>>
>>>>>>> https://docs.google.com/document/d/1-idhx8heajbPYl3cdXFVCjpIuf96cRa_DrRk6147ELI/edit?usp=sharing
>>>>>>>
>>>>>>> Summary 
>>>>>>>
>>>>>>> Adds a "scope_extensions" app manifest member that enables web apps 
>>>>>>> to extend their scope to other origins. Example usage: { "name": 
>>>>>>> "Example", 
>>>>>>> "display": "standalone", "start_url": "/index.html", 
>>>>>>> "scope_extensions": [ 
>>>>>>> {"origin": "https://*.example.com"}, {"origin": 
>>>>>>> "https://example.co.uk"; <https://example.co.uk>}, {"origin": 
>>>>>>> "https://*.example.co.uk"} ] } This allows sites that control 
>>>>>>> multiple subdomains and top level domains to be presented as a single 
>>>>>>> web 
>>>>>>> app. Requires listed origins to confirm association with the web app 
>>>>>>> using 
>>>>>>> a .well-known/web-app-origin-association configuration file. { 
>>>>>>> "web_apps" : 
>>>>>>> [ {"web_app_identity": "https://sample-app.com/"; 
>>>>>>> <https://sample-app.com/>} ] }
>>>>>>>
>>>>>>>
>>>>>>> Blink component
>>>>>>> UI>Browser>WebAppInstalls 
>>>>>>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:UI%3EBrowser%3EWebAppInstalls>
>>>>>>>
>>>>>>> TAG review
>>>>>>> https://github.com/w3ctag/design-reviews/issues/875
>>>>>>>
>>>>>>> TAG review status
>>>>>>> Pending
>>>>>>>
>>>>>>> Risks
>>>>>>>
>>>>>>> Interoperability and Compatibility 
>>>>>>> *Gecko*: No signal (
>>>>>>> https://github.com/mozilla/standards-positions/issues/904)
>>>>>>>
>>>>>>> *WebKit*: No signal (
>>>>>>> https://github.com/WebKit/standards-positions/issues/265)
>>>>>>>
>>>>>>> *Web developers*: No signals
>>>>>>>
>>>>>>> *Other signals*:
>>>>>>>
>>>>>>> Ergonomics
>>>>>>>
>>>>>>> None.
>>>>>>>
>>>>>>>
>>>>>>> Activation 
>>>>>>>
>>>>>>> None.
>>>>>>>
>>>>>>>
>>>>>>> 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?
>>>>>>>
>>>>>>>
>>>>>>> Goals for experimentationAllow app partners to experiment more 
>>>>>>> broadly with the scope_extensions feature and provide feedback. We want 
>>>>>>> to 
>>>>>>> evaluate the shape of the scope_extensions API for ease of use and 
>>>>>>> expose 
>>>>>>> any corner cases. Specifically, we want to understand if origin-level 
>>>>>>> granularity is sufficient without path filters. We will evaluate this 
>>>>>>> based 
>>>>>>> on feedback from OT participants. 
>>>>>>>
>>>>>>> Ongoing technical constraints 
>>>>>>>
>>>>>>> None.
>>>>>>>
>>>>>>>
>>>>>>> Debuggability 
>>>>>>>
>>>>>>> DevTools Application pane will be the appropriate surface to add 
>>>>>>> debugging support. Specifically, a section can be added to help 
>>>>>>> troubleshoot the status of origin association validation. Additionally, 
>>>>>>> edge://web-app-internals/ also have relevant information for debugging.
>>>>>>>
>>>>>>>
>>>>>>> Will this feature be supported on all six Blink platforms (Windows, 
>>>>>>> Mac, Linux, Chrome OS, Android, and Android WebView)?No 
>>>>>>>
>>>>>>> Supported on Windows, MacOS, Linux, ChromeOS. Not supported on 
>>>>>>> mobile platforms where app identity is implemented differently.
>>>>>>>
>>>>>>>
>>>>>>> Is this feature fully tested by web-platform-tests 
>>>>>>> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
>>>>>>> ?
>>>>>>> No
>>>>>>>
>>>>>>> Flag name on chrome://flags
>>>>>>> about://flags/#enable-desktop-pwas-scope-extensions
>>>>>>>
>>>>>>> Finch feature name
>>>>>>> None
>>>>>>>
>>>>>>> Non-finch justification
>>>>>>> None
>>>>>>>
>>>>>>> Requires code in //chrome?
>>>>>>> False
>>>>>>>
>>>>>>> Tracking bug
>>>>>>> https://bugs.chromium.org/p/chromium/issues/detail?id=1250011
>>>>>>>
>>>>>>> Estimated milestones
>>>>>>> Dev Trial - 115
>>>>>>> Origin Trial 120 or 121
>>>>>>>
>>>>>>>
>>>>>>> *Link to entry on the Chrome Platform Status *
>>>>>>> https://chromestatus.com/feature/5746537956114432
>>>>>>>
>>>>>>> Links to previous Intent discussions
>>>>>>> Intent to prototype: 
>>>>>>> https://groups.google.com/a/chromium.org/g/blink-dev/c/-iySPmw8o34/m/oLgrCUQXAQAJ
>>>>>>>  
>>>>>>> Ready for Trial: 
>>>>>>> https://groups.google.com/a/chromium.org/g/blink-dev/c/OBZBZwS6qr0/m/VRySwd40AQAJ
>>>>>>>
>>>>>>>
>>>>>>> This intent message was generated by Chrome Platform Status 
>>>>>>> <https://chromestatus.com/>.
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>>>>>>>  
>>>>>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/37136c0f-1f17-4da1-9398-b8ba890d2ee2n%40chromium.org?utm_medium=email&utm_source=footer>
>>>>>>> .
>>>>>>>
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>>>>>> To view this discussion on the web visit 
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>>>>>>>  
>>>>>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/52dd7f02-9ccc-4b57-9293-a9d1450bbbd5%40chromium.org?utm_medium=email&utm_source=footer>
>>>>>>> .
>>>>>>>
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>>>>  
>>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/d81efcbf-9396-4d52-ba8f-a4d7eec302fcn%40chromium.org?utm_medium=email&utm_source=footer>
>>>> .
>>>>
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>> To view this discussion on the web visit 
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>>>
>>

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