Re: Privacy Review Request for CSS Color Adjust Level 1

Thanks for sending in this request Fantasai. We will assign the review at our next PING meeting on 17 December 2020 at UTC 17.

Christine (co-chair)

> On Dec 7, 2020, at 11:48 AM, fantasai <fantasai.lists@inkedblade.net> wrote:
> 
> [forgot to CC www-style, please reply to this copy so we get your response!]
> 
> CSS WG requests formal review of CSS Color Adjustment Module Level 1
>  https://www.w3.org/TR/css-color-adjust-1/

> 
> This module introduces a model and controls over automatic color adjustment by the user agent to handle user preferences, such as "Dark Mode", contrast adjustment, or specific desired color schemes.
> 
> These features work together with related features in Media Queries 5 <https://www.w3.org/TR/mediaqueries-5/> and the system colors in CSS Color 4 <https://www.w3.org/TR/css-color-4/#css-system-colors>:
>  * media queries allow the author to query the UA
>  * color-adjust properties allow the author to give hints to the UA
>  * system colors allow the author to use colors from the forced palette
> 
> See these minutes for an overview and explainer for forced colors mode (corresponds to Microsoft’s “Windows High Contrast Mode”):
>  https://lists.w3.org/Archives/Public/www-style/2019Apr/0004.html

> 
> This spec is in the "Refining" stage of development, per
>  http://fantasai.inkedblade.net/weblog/2011/inside-csswg/process

> and is being actively implemented by browsers.
> 
> The Privacy and Security Considerations section is here:
> https://www.w3.org/TR/css-color-adjust-1/#priv-sec

> 
> Please raise any issues in the csswg GitHub repo:
>   https://github.com/w3c/csswg-drafts/issues

> and let us know when you have completed your review.
> 
> Thanks!
> 
> = Self-Review Questionnaire: Security and Privacy =
> 
> 2.1 What information might this feature expose to Web sites or other parties, and for what purposes is that exposure necessary?
> 
> The user's preferred color palette is exposed through getComputedStyle in forced color mode and also if the author uses any system color keywords.
> 
> The use of these colors is necessary, otherwise it's impossible to honor those preferences.
> 
> 2.2 Is this specification exposing the minimum amount of information necessary to power the feature?
> 
> Currently under debate, see https://github.com/w3c/csswg-drafts/issues/5710

> We could lie to the web page about the actual color used, but this has the potential to make the page unreadable if the author is using those answers to set its own colors.
> 
> 2.3 How does this specification deal with personal information or personally-identifiable information or information derived thereof?
> 
> Not applicable
> 
> 2.4 How does this specification deal with sensitive information?
> 
> Not applicable
> 
> 2.5 Does this specification introduce new state for an origin that persists across browsing sessions?
> 
> No
> 
> 2.6 What information from the underlying platform, e.g. configuration data, is exposed by this specification to an origin?
> 
> Preferred color palette is exposed.
> 
> 2.7 Does this specification allow an origin access to sensors on a user’s device
> 
> No
> 
> 2.8 What data does this specification expose to an origin? Please also document what data is identical to data exposed by other features, in the same or different contexts.
> 
> Preferred color palette is exposed.
> 
> 2.9 Does this specification enable new script execution/loading mechanisms?
> 
> No
> 
> 2.10 Does this specification allow an origin to access other devices?
> 
> No
> 
> 2.11 Does this specification allow an origin some measure of control over a user agent’s native UI?
> 
> No
> 
> 2.12 What temporary identifiers might this this specification create or expose to the web?
> 
> None
> 
> 2.13 How does this specification distinguish between behavior in first-party and third-party contexts?
> 
> Not applicable
> 
> 2.14 How does this specification work in the context of a user agent’s Private Browsing or "incognito" mode?
> 
> No difference
> 
> 2.15 Does this specification have a "Security Considerations" and "Privacy Considerations" section?
> 
> Yes https://drafts.csswg.org/css-color-adjust-1/#priv-sec

> 
> 2.16 Does this specification allow downgrading default security characteristics?
> 
> No
> 
> 2.17 What should this questionnaire have asked?
> 
> Nothing springs to mind.
> 
>

Received on Tuesday, 15 December 2020 16:38:09 UTC