On 8/30/23 3:55 PM, Luke wrote:
Contact emails
lukewarlow...@gmail.com, l...@warlow.dev
Explainer
https://github.com/wicg/user-preference-media-features-headers/blob/main/README.md
Specification
https://wicg.github.io/user-preference-media-features-headers/#sec-ch-prefers-reduced-transparency
Summary
User Preference Media Features Client Hints Header defines a set of
HTTP Client Hints headers around user preference media features as
defined by Media Queries Level 5. If used as Critical Client Hints,
these headers allow servers to make smart choices regarding, e.g., CSS
inlining. Sec-CH-Prefers-Reduced-Transparency reflects the user's
prefers-reduced-transparency preference.
Blink component
Blink>CSS
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>
Search tags
client hints <https://chromestatus.com/features#tags:client%20hints>,
sec-ch-prefers-reduced-transparency
<https://chromestatus.com/features#tags:sec-ch-prefers-reduced-transparency>,
prefers-reduced-transparency
<https://chromestatus.com/features#tags:prefers-reduced-transparency>
TAG review
Anything relevant to link here?
TAG review status
Pending
Risks
Interoperability and Compatibility
/Gecko/: No signal
(https://github.com/mozilla/standards-positions/issues/526)
/WebKit/: No signal
(https://github.com/WebKit/standards-positions/issues/15)
/Web developers/: Positive (WICG proposal Issue:
https://github.com/WICG/proposals/issues/30 with feedback from
developers working for Facebook and Magento. Twitter:
https://twitter.com/kilianvalkhof/status/1392404416335056896. The
proposal was initially discussed in
https://github.com/w3c/csswg-drafts/issues/4162 and received positive
feedback via 18 Likes)
/Other signals/:
Activation
Developers will include Sec-CH-Prefers-Reduced-Transparency in the
response headers Accept-CH and Critical-CH to let the browser know
that they’re interested in the user's transparency preferences. If
supported, the request header Sec-CH-Prefers-Reduced-Transparency will
be populated with the appropriate value. This follows the same pattern
as existing Preference Client Hints and as such should be easy for
developers to make use of.
Security
This feature could be used for fingerprinting as it exposes a user
preference. However, this is already exposed to CSS/JS by the
`prefers-reduced-transparency` media query.
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
Developers can change this client hint header value by emulating
prefers-reduced-transparency via Devtools in the Rendering Panel.
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 depends 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
ClientHintsPrefersReducedTransparency
Requires code in //chrome?
False
Tracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1466423
Sample links
https://sec-ch-prefers-reduced-transparency.glitch.me
Estimated milestones
Shipping on desktop 118
DevTrial on desktop 118
Shipping on Android 118
DevTrial on Android 118
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/6242983812268032
Links to previous Intent discussions
Intent to prototype:
https://groups.google.com/a/chromium.org/d/msgid/blink-dev/B1ED49A6-31BF-4D28-89B3-D2973F9F12DA%40gmail.com
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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