On 7/20/23 8:19 AM, 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>
Motivation
CSS media queries, and specifically user preference media features
like `prefers-reduced-transparent` or `prefers-reduced-motion`, have a
potentially significant impact on the amount of CSS that needs to be
delivered by a page, and on the experience the user is going to have
when the page loads. Focusing on `prefers-color-scheme`—but
highlighting that the reasoning applies to other user preference media
features as well—it is a best practice to not load CSS for the
particular non-matching color scheme in the critical rendering path,
and instead to initially only load the currently relevant CSS. One way
of doing so is via `<link media>`. However, high-traffic sites like
Google Search that wish to honor user preference media features like
`prefers-color-scheme` and that inline CSS for performance reasons,
need to know about the preferred color scheme (or other user
preference media features respectively) ideally at request time, so
that the initial HTML payload already has the right CSS inlined.
Initial public proposal
https://github.com/w3c/csswg-drafts/issues/4162
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
TAG review status
Pending
Risks
Interoperability and Compatibility
/Gecko/: No signal
/WebKit/: No signal
Have we asked for signals?
/Web developers/: No signals
If Google Search is asking for this, it seems like we have some signal, no?
/Other signals/:
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
Anything to note here?
Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?
No
Why not?
Flag name on chrome://flags
Finch feature name
Presumably we have a base::Feature, non?
Non-finch justification
None
Requires code in //chrome?
False
Tracking bug
https://bugs.chromium.org/p/chromium/issues/detail?id=1466423
Estimated milestones
No milestones specified
Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/6242983812268032
Links to previous Intent discussions
This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.
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