LGTM1 On Wed, Nov 19, 2025 at 7:03 AM Rune Lillesveen <[email protected]> wrote:
> *Contact emails* > [email protected] > > *Specification* > https://drafts.csswg.org/css-conditional-5/#container-name > > *Summary* > Ignore tree-scope when matching container-name for @container queries. > > Previously, container-name matching for container queries used tree-scoped > names/references for matching, which meant the same name would not match if > the @container rule and the container-type property were originating from > different trees such that that container-type declaration came from an > inner shadow tree. > > With this change container names match regardless of @container rule or > container-type declaration origins. > > *Blink component* > Blink>CSS > <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ECSS%22> > > *Web Feature ID* > Missing feature > > *Motivation* > Aligning with the spec change and Firefox implementation. > > *Initial public proposal* > *No information provided* > > *TAG review* > *No information provided* > > *TAG review status* > Not applicable > > *Risks* > > > *Interoperability and Compatibility* > The risk is that container-names set in shadow trees may now match as flat > tree ancestor container for outer tree elements which are slotted into the > shadow tree, or for ::part rules targeting elements inside the shadow tree > which additionally rely on @container queries in outer tree rules. > > M142 introduced a use counter along with the implementation for detecting > such cases in the wild: > https://chromestatus.com/metrics/feature/timeline/popularity/5659 > > Three sites reported back: > > https://redhatofficial.github.io/: Sets padding which is overridden by > another declaration not affected by container queries. No change. > > https://www.redhat.com/: Sets padding to 0, which is also the initial > value. No change. > > https://www.kansascityfed.org/: Not able to trigger loading or navigating > around this site. > > Firefox has always shipped this behavior without noticing any interop > issues according to the discussion in > https://github.com/w3c/csswg-drafts/issues/12090#issuecomment-3204775586 > > *Gecko*: Shipped/Shipping Firefox shipped this behavior in their initial > release of container queries. > > *WebKit*: Shipped/Shipping In Safari TP > > *Web developers*: No signals > > *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? > *No information provided* > > > *Debuggability* > *No information provided* > > *Will this feature be supported on all six Blink platforms (Windows, Mac, > Linux, ChromeOS, 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 > > https://wpt.fyi/results/css/css-conditional/container-queries/container-for-shadow-dom.html > > https://wpt.fyi/results/css/css-conditional/container-queries/container-units-shadow.html > > *Flag name on about://flags* > #experimental-web-platform-features > > *Finch feature name* > CSSContainerNameNotTreeScoped > > *Rollout plan* > Will ship enabled for all users > > *Requires code in //chrome?* > False > > *Tracking bug* > https://crbug.com/440049800 > > *Estimated milestones* > Shipping on desktop 144 > DevTrial on desktop 142 > Shipping on Android 144 > DevTrial on Android 142 > Shipping on WebView 144 > > *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). > *No information provided* > > *Link to entry on the Chrome Platform Status* > https://chromestatus.com/feature/5194034339512320?gate=4770497078362112 > > This intent message was generated by Chrome Platform Status > <https://chromestatus.com/>. > > -- > Rune Lillesveen > > -- > You received this message because you are subscribed to the Google Groups > "blink-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACuPfeSPHANJS4nmVo_LyvoA_XYJNnHqjp9tCE3A9UjhoNhJRQ%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CACuPfeSPHANJS4nmVo_LyvoA_XYJNnHqjp9tCE3A9UjhoNhJRQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOMQ%2Bw_GWkHctpOG9rpTKOQ0cDvTtaTtJJiJ2k2F-i35oqQPhw%40mail.gmail.com.
