https://github.com/w3ctag/design-reviews/issues/881 I've filed a tag
review (hopefully filled it all out correctly)
On Wednesday, 2 August 2023 at 00:03:46 UTC+1 Chris Harrelson wrote:
Hi Luke, could you file for a TAG review for this feature?
On Tue, Aug 1, 2023 at 7:56 AM 'David Bolter' via blink-dev
<[email protected]> wrote:
I agree with Mike that the incremental entropy available is
probably acceptable. I don't have any data/awareness of
demand for this setting but it is at least some signal that
it is available on Windows, Mac, iOS (thanks Luke). I'll ping
some folks and come back (or they will) if there is info to
share.
On Monday, July 31, 2023 at 1:41:45 PM UTC-4 Luke wrote:
Is there anything more I can do to help move this
conversation forward? I would try to gather a consensus
that authors would use it but I don't have a following
large enough to gather anything valuable.
On Wednesday, 26 July 2023 at 17:27:27 UTC+1 Luke wrote:
> ...effectively empty, with an inline issue saying
~"TODO: figure out if these are OK".
I've added a comment
<https://github.com/w3c/csswg-drafts/issues/3488#issuecomment-1652125743>
to an existing CSS spec issue regarding that issue
section.
> Based on
https://github.com/WebKit/standards-positions/issues/145#issuecomment-1478736469,
it doesn't seem like there's a lot of appetite from
Apple or Mozilla.
There's mixed signals from Mozilla and especially
Apple imo.
While Apple have added a general concerns label for
all `prefers-*` media queries, they've also
implemented at least 3 of them along with being the
only UA to currently expose `inverted-colors`
information. They've also made 1 of the two current
issues regarding potential new preference media
queries (namely prefers-reduced-strobing
<https://github.com/w3c/csswg-drafts/issues/8651>)
Mozilla likewise don't seem overly keen on
prefers-reduced-transparency (a third party
implemented it recently but so far it remains
disabled by default) but have also exposed the 3
existing prefers media queries along with also
implementing `forced-colors` (Apple has too but it
always evaluates to false so isn't relavant). They
also started a PR
<https://github.com/mozilla/standards-positions/pull/410>
to add a supportive position for the preference media
queries given their accessibility benefits.
> My own take is that if it can benefit some users,
and sites will use it, the incremental entropy
available here is probably acceptable.
I would agree if there's an improved accessibility
experience it's worth the privacy tradeoff imo. As
for how useful users and site authors would find it
I'm not sure how best to go about finding that out.
There's various blog posts mentioning it, and
obviously there must be some benefit to exposing the
settings else Microsoft and Apple wouldn't have
explicit settings for it. Potentially some a11y
specialists could chime in on this front?
On Wednesday, 26 July 2023 at 16:28:42 UTC+1
[email protected] wrote:
As to the fingerprintability, we should think
about the trade-offs we're making between
accessibility and adding more active surfaces
that give away some bits of entropy. I'd love to
hear more about requests from the a11y or
developer community to actually have this MQ
available to them. My own take is that if it can
benefit some users, and sites will use it, the
incremental entropy available here is probably
acceptable.
I note that
https://drafts.csswg.org/mediaqueries-5/#mq-prefers-security
is effectively empty, with an inline issue saying
~"TODO: figure out if these are OK". That doesn't
seem super great. Do we know if there is
consensus among editors on the utility vs privacy
trade offs of these MQs? (Maybe Tab can chime in
on this topic...).
Based on
https://github.com/WebKit/standards-positions/issues/145#issuecomment-1478736469,
it doesn't seem like there's a lot of appetite
from Apple or Mozilla.
On 7/24/23 4:13 AM, Yoav Weiss wrote:
I'd love to hear +Mike Taylor 's thought about
this from an extra fingerprinting bit
perspective. Also, how would users signal their
preference?
On Fri, Jul 21, 2023, 23:21 Luke
<[email protected]> wrote:
Contact emails
[email protected], [email protected]
Explainer
None
Specification
https://drafts.csswg.org/mediaqueries-5/#prefers-reduced-transparency
Summary
Adds the `prefers-reduced-transparency`
feature, which lets authors adapt web
content to user-selected preference for
reduced transparency in the OS, such as the
'Reduce transparency' setting on macOS.
Valid options are 'reduce' or 'no-preference'.
Blink component
Blink>CSS
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>
Search tags
css
<https://chromestatus.com/features#tags:css>,
prefers-reduced-transparency
<https://chromestatus.com/features#tags:prefers-reduced-transparency>
TAG review
None
TAG review status
Not applicable
Risks
Interoperability and Compatibility
/Gecko/: No signal
(https://github.com/mozilla/standards-positions/issues/851)
There is a separate umbrella issue for some
the preference media queries (contrast,
motion, color-scheme). They have a stale PR
to add an overall positive position for
those preference media queries. They also
have an implementation behind a flag. It's
not been enabled yet due to fingerprinting
concerns.
/WebKit/: No signal
(https://github.com/WebKit/standards-positions/issues/145)
I have submitted an implementation of this
feature as a PR to WebKit:
https://github.com/WebKit/WebKit/pull/11560
/Web developers/: Positive
(https://blog.logrocket.com/new-media-queries-you-need-to-know)
/Other signals/:
Security
This feature can be used for fingerprinting
as it exposes a user preference.
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?
Debuggability
This can be emulated in the Dev Tools
rendering tab like other preference media
queries.
Will this feature be supported on
all six Blink platforms (Windows,
Mac, Linux, Chrome OS, Android, and
Android WebView)?
Yes
The feature will be supported on all
platforms, but whether the user will be able
to signal a reduced transparency preference
may depend on the OS.
Is this feature fully tested by
web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
Yes
Flag name on chrome://flags
#enable-experimental-web-platform-features
Finch feature name
PrefersReducedTransparency
Requires code in //chrome?
False
Tracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1424879
Sample links
https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-transparency#examples
Estimated milestones
Shipping on desktop 117
DevTrial on desktop 117
Shipping on Android 117
DevTrial on Android 117
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).
Link to entry on the Chrome Platform
Status
https://chromestatus.com/feature/5191066147356672
Links to previous Intent discussions
Intent to prototype:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/6D62B5CD-B44D-4CB1-B85A-F73DFFD6CE85%40gmail.com
This intent message was generated by Chrome
Platform Status <https://chromestatus.com/>.
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