LGTM1

For other reviewers, I verified these tests are all passing 100% (thank you
Rune!):
https://wpt.fyi/css/css-contain/container-queries/custom-property-style-queries.html
https://wpt.fyi/css/css-contain/container-queries/custom-property-style-query-change.html
https://wpt.fyi/css/css-contain/container-queries/at-container-parsing.html
https://wpt.fyi/css/css-contain/container-queries/at-container-style-serialization.html


On Fri, Dec 16, 2022 at 5:13 AM Rune Lillesveen <[email protected]>
wrote:

> Contact [email protected]
>
> Explainerhttps://css.oddbird.net/rwd/style/explainer
>
> Specificationhttps://drafts.csswg.org/css-contain-3/#style-container
>
> Summary
>
> Adds a style() function to @container rules to make it possible to apply
> styles based on the computed values of custom properties of an ancestor
> element. style() queries can be combined with size container queries which
> shipped in M105.
>
>
> Blink componentBlink>CSS
> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>
>
> TAG reviewhttps://github.com/w3ctag/design-reviews/issues/787
>
> TAG review statusPending
>
> Risks
>
>
> Interoperability and Compatibility
>
> None of the other vendors have responded to the standards-positions or, to
> my knowledge, started implementing. There were concerns raised by an Apple
> engineer in https://github.com/w3c/csswg-drafts/issues/7185 mainly for
> standard property queries. This intent is for shipping support for custom
> property queries only.
>
>
> *Gecko*: No signal (
> https://github.com/mozilla/standards-positions/issues/686)
>
> *WebKit*: No signal (
> https://github.com/WebKit/standards-positions/issues/57)
>
> *Web developers*: No signals
>
> *Other signals*:
>
> Activation
>
> Feature detection is not very ergonomic before we add at-prelude testing
> to @supports, which requires a resolution for [1]. [1]
> https://github.com/w3c/csswg-drafts/issues/6966
>
>
> 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
>
> DevTools may need to show style containers like it is done with size
> container queries today. However, all elements are style containers by
> default, so probably not the same type of UI. There is an issue where we
> look up the wrong container, that is, always assume that the closest
> container supporting logical inline axis queries is the closest one:
> https://crbug.com/1378237 If we fix that issue, we will automatically
> also implement correct container lookup for pure style containers. That
> should work both for highlighting elements querying a given container, and
> also list the query for the matched style rule correctly.
>
>
> Will this feature be supported on all six Blink platforms (Windows, Mac,
> Linux, Chrome OS, Android, and Android WebView)?Yes
>
> 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#enable-experimental-web-platform-features / CSSStyleQueries
> (Blink)
>
> Requires code in //chrome?False
>
> Tracking bughttps://crbug.com/1302630
>
> Sample links
> https://www.bram.us/2022/10/14/container-queries-style-queries
> https://una.im/style-queries
>
> Estimated milestones
> DevTrial on desktop 107
> DevTrial on Android 107
>
> 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/5076875399921664
>
> This intent message was generated by Chrome Platform Status
> <https://chromestatus.com/>.
>
> --
> Rune Lillesveen
>
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> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACuPfeSQJOPtK%2BOmFj%2B7F%3DbCqqspoKshc7nDb0fh1BSoHmz95g%40mail.gmail.com?utm_medium=email&utm_source=footer>
> .
>

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