LGTM3 On Wed, Nov 19, 2025 at 7:19 PM Mike Taylor <[email protected]> wrote:
> LGTM2 > On 11/19/25 11:23 a.m., Chris Harrelson wrote: > > 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 > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAOMQ%2Bw_GWkHctpOG9rpTKOQ0cDvTtaTtJJiJ2k2F-i35oqQPhw%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/d1904dd4-d358-49d9-b48c-30856abdfd75%40chromium.org > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/d1904dd4-d358-49d9-b48c-30856abdfd75%40chromium.org?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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