Hola Yoav, I am looking at making the amendments listed on the github 
issues. I will update soon with the changes. Thanks 

On Monday, 15 November 2021 at 08:44:41 UTC yoav...@chromium.org wrote:

> Thanks Diego! The updates are a great improvement, but I suspect are not 
> sufficient for an interoperable implementation. I left a couple of comments 
> on the open issues.
>
> On Wed, Nov 10, 2021 at 5:11 PM Diego González <die...@gmail.com> wrote:
>
>> Hola Yoav,
>>
>> We've gone through several iterations of the WCO spec reviewed by Joshua 
>> Bell from Google, and while we are still making changes to it, we believe 
>> it is in a much better state and want to resubmit for consideration of the 
>> approvals needed for I2S.  See the updated spec below:
>> https://wicg.github.io/window-controls-overlay/
>>
>> --Diego
>>
>> On Thursday, 21 October 2021 at 21:05:09 UTC+1 yoav...@chromium.org 
>> wrote:
>>
>>> On Thursday, October 21, 2021 at 9:31:23 AM UTC+2 Yoav Weiss wrote:
>>>
>>>> This is an exciting improvement to PWA parity with native apps! :) 
>>>>
>>>> On Wed, Oct 20, 2021 at 10:49 PM 'Diego Gonzalez' via blink-dev <
>>>> blin...@chromium.org> wrote:
>>>>
>>>>> Contact emails 
>>>>>
>>>>> amb...@microsoft.com, luig...@microsoft.com, hat...@microsoft.com, 
>>>>> c...@chromium.org
>>>>>
>>>>>  
>>>>> Explainer 
>>>>>
>>>>>
>>>>> https://github.com/WICG/window-controls-overlay/blob/master/explainer.md
>>>>>
>>>>>  
>>>>> Specification 
>>>>>
>>>>> https://wicg.github.io/window-controls-overlay/ 
>>>>>
>>>>
>>>> The spec looks like it could use some work. Beyond the editorial, it 
>>>> doesn't seem like it defines the novel concepts that it introduces, nor 
>>>> the 
>>>> relevant processing models.
>>>>
>>>
>>> Let me expand on that a bit. The spec introduces a new concept of a 
>>> "window overlay" without really creating it as a concept. 
>>> What I expect an interoperable spec to define the concept with as much 
>>> detail as possible without getting OS- or implementation-specific. 
>>> (Just to draw an example of what I have in mind, if I had to make 
>>> something up, I'd go with something like: "<dfn>Window overlay</dfn> is an 
>>> interface element that the operating system uses consistently across 
>>> applications to enable the user to perform certain action to control the 
>>> application such as closing it, expanding it to full screen, etc. This UI 
>>> element takes fixed dimensions....")
>>>
>>> Then, once you have that concept defined, you can start building on it 
>>> and define the processing of the different methods based on that.
>>>
>>> I'll open issues with other suggestions.
>>>
>>>  
>>>>
>>>>>  
>>>>> Design docs 
>>>>>
>>>>>  
>>>>>
>>>>> https://github.com/WICG/window-controls-overlay/blob/main/explainer.md
>>>>>
>>>>>  
>>>>> Summary 
>>>>>
>>>>> Window Controls Overlay allows a developer to create a custom title 
>>>>> bar UX by extending the installed app’s client area. The client area now 
>>>>> covers the entire window except for the window controls (close, 
>>>>> maximize/restore, minimize), which are overlaid in their respective 
>>>>> position. 
>>>>>
>>>>>  
>>>>>
>>>>> The web app developer is responsible for drawing and input-handling 
>>>>> for the entire window except for the window controls overlay. This 
>>>>> includes defining which area of the window is draggable as well, with a 
>>>>> prefixed and non-prefixed version of a css property supported, as 
>>>>> implemented in: crrev.com/c/3094474.
>>>>>
>>>>>  
>>>>>
>>>>> Intended uses for the Window Controls Overlay are creating seamless UX 
>>>>> that can use the area that was reserved for the title bar before. Many 
>>>>> modern applications include menus, search bars and other controls in the 
>>>>> title bar, and this feature enables this on installed web apps.
>>>>>
>>>>>  
>>>>> Blink component 
>>>>>
>>>>> UI>Browser>WebAppInstalls 
>>>>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:UI%3EBrowser%3EWebAppInstalls>
>>>>>
>>>>>  
>>>>> Search tags 
>>>>>
>>>>> PWA <https://chromestatus.com/features#tags:PWA>, web app 
>>>>> <https://chromestatus.com/features#tags:web%20app>, title bar 
>>>>> <https://chromestatus.com/features#tags:title%20bar>, titlebar 
>>>>> <https://chromestatus.com/features#tags:titlebar>, customization 
>>>>> <https://chromestatus.com/features#tags:customization>, window 
>>>>> controls <https://chromestatus.com/features#tags:window%20controls>
>>>>>
>>>>>  
>>>>> TAG review 
>>>>>
>>>>> https://github.com/w3ctag/design-reviews/issues/481
>>>>>
>>>>>  
>>>>> TAG review status 
>>>>>
>>>>> Resolution: satisfied
>>>>>
>>>>>  
>>>>> Risks 
>>>>>
>>>>>  
>>>>> Interoperability and Compatibility 
>>>>>
>>>>> Given that Edge has interest in the feature, there would be at least 
>>>>> one other browser that implements it. The feature involves additive 
>>>>> changes 
>>>>> (new web app manifest entry, new JS API, new CSS env variables) and 
>>>>> modifications (changes to frame, new use of env(safe-area-inset-*), but 
>>>>> no 
>>>>> removals, so the compatibility risk is minimal.
>>>>>
>>>>  
>>>>>
>>>>> Gecko: defer https://github.com/mozilla/standards-positions/issues/529
>>>>>  
>>>>>
>>>>>  
>>>>>
>>>>> WebKit: No signal 
>>>>> https://lists.webkit.org/pipermail/webkit-dev/2021-May/031865.html 
>>>>>
>>>>>  
>>>>>
>>>>> Web developers: Positive
>>>>>
>>>>> https://twitter.com/firt/status/1385238446046859268?s=20
>>>>>
>>>>> https://twitter.com/AnaestheticsApp/status/1408727417330573314?s=20
>>>>>
>>>>> https://twitter.com/bashik7/status/1385821988208275457?s=20
>>>>>
>>>>> https://twitter.com/abraham/status/1385201046767738880?s=20
>>>>>
>>>>>  
>>>>> Ergonomics 
>>>>>
>>>>> The changes associated with this feature will only be enabled for PWAs 
>>>>> that opt-in to it, so there are minimal risks posed to the browser as a 
>>>>> whole. A PWA that opts-in to the feature should also have minimal 
>>>>> ergonomics risk since the manifest already needs to be parsed on startup 
>>>>> to 
>>>>> determine the correct display mode in which the app should be launched, 
>>>>> so 
>>>>> adding one extra manifest check on startup should have minimal impact.
>>>>>
>>>>>  
>>>>> Activation 
>>>>>
>>>>> The activation risk is low since this feature includes all the tools 
>>>>> needed to create an app that uses the full extent of the window: new 
>>>>> UA-provided window controls overlay, JS APIs to query the size of the 
>>>>> overlay, and CSS environment variables to layout content around the 
>>>>> overlay.
>>>>>
>>>>
>>>> What do we expect developers to do as a fallback in non-supporting 
>>>> browsers?  
>>>>
>>>>>  
>>>>> Security 
>>>>>
>>>>> The major risk is that giving sites partial control over the top of 
>>>>> the app window allows developers to spoof content in what was previously 
>>>>> a 
>>>>> trusted, UA-controlled region. To minimize the risk of spoofing, the app 
>>>>> will open by default in “standalone” mode with a full width title bar, 
>>>>> and 
>>>>> the user can toggle window controls overlay on and off via a button in 
>>>>> the 
>>>>> title bar/overlay.
>>>>>
>>>>
>>>> OK, so both the app *and* the user need to opt-in? 
>>>>
>>>>>  
>>>>> Debuggability 
>>>>>
>>>>> The feature itself can be easily debugged by installing the PWA. Since 
>>>>> it is a visual feature on the window itself, it is easy to test. 
>>>>> Nonetheless, making sure parsing the “display-override” mode and 
>>>>> associated 
>>>>> values correctly is desired, which should be incorporated into the 
>>>>> application tab of devtools, where all the other manifest warnings are 
>>>>> displayed. 
>>>>>
>>>>>  
>>>>> Is this feature fully tested by web-platform-tests 
>>>>> <https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md>
>>>>> ? 
>>>>>
>>>>> 3170531: dpwas: WPT Tests for window-controls-overlay | 
>>>>> https://chromium-review.googlesource.com/c/chromium/src/+/3170531
>>>>>
>>>>>  
>>>>> Flag name 
>>>>>
>>>>> #enable-desktop-pwas-window-controls-overlay
>>>>>
>>>>>  
>>>>> Requires code in //chrome? 
>>>>>
>>>>> False
>>>>>
>>>>>  
>>>>> Tracking bug 
>>>>>
>>>>> https://bugs.chromium.org/p/chromium/issues/detail?id=937121
>>>>>
>>>>>  
>>>>> Launch bug 
>>>>>
>>>>> https://crbug.com/1108107
>>>>>
>>>>>  
>>>>> Sample links 
>>>>>
>>>>>  
>>>>>
>>>>> https://amandabaker.github.io/pwa/explainer-example/index.html
>>>>>
>>>>>  
>>>>> Estimated milestones 
>>>>>
>>>>> OriginTrial desktop last
>>>>>
>>>>> 96
>>>>>
>>>>> OriginTrial desktop first
>>>>>
>>>>> 93
>>>>>
>>>>> Expected Release
>>>>>
>>>>> 97
>>>>>
>>>>>  
>>>>> Link to entry on the Chrome Platform Status 
>>>>>
>>>>> https://chromestatus.com/feature/5741247866077184
>>>>>
>>>>>  
>>>>> Links to previous Intent discussions 
>>>>>
>>>>> Intent to prototype: 
>>>>> https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/cper6nNLFRQ/hU91kfCWBQAJ
>>>>>
>>>>> Intent to Experiment: 
>>>>> https://groups.google.com/a/chromium.org/g/blink-dev/c/HNHbpxvrECA/m/JJoXKQI3BAAJ
>>>>>
>>>>>  
>>>>>
>>>>> This intent message was generated by Chrome Platform Status 
>>>>> <https://www.chromestatus.com/>.
>>>>>
>>>>>  
>>>>>
>>>>>  
>>>>>
>>>>> Regards,
>>>>>
>>>>>  
>>>>>
>>>>> *Diego González-Zúñiga*
>>>>>
>>>>> PM, Microsoft Edge
>>>>>
>>>>>  
>>>>>
>>>>>  
>>>>>
>>>>> -- 
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>>>>>
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>>>>
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>>>>>  
>>>>> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/VI1PR83MB041666BD26451656C388347CCCBE9%40VI1PR83MB0416.EURPRD83.prod.outlook.com?utm_medium=email&utm_source=footer>
>>>>> .
>>>>>
>>>>

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