Could you file a Mozilla standards request? On Wed, Sep 23, 2026 at 3:56 PM Mason Freed <[email protected]> wrote:
> *Contact emails* > [email protected] > > *Explainer* > *No information provided* > > *Specification* > https://drafts.csswg.org/css-anchor-position-1/#position-visibility > > *Summary* > The `anchors-valid` value was implemented as part of > https://crbug.com/329703412 but subsequently reverted, due to spec > questions about the exact definition of the value. Since that time, the > value has been renamed to `anchor-valid` (see > https://chromestatus.com/feature/5136123851571200) and also better > defined to be clear that only the default anchor matters, resolving a lot > of ambiguity, and making this value shippable. > > *Blink component* > Blink>CSS > <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ECSS%22> > > *Web Feature ID* > anchor-positioning <https://webstatus.dev/features/anchor-positioning> > > *Motivation* > *No information provided* > > *Initial public proposal* > *No information provided* > > *Search tags* > position-visibility > <https://chromestatus.com/features#tags:position-visibility>, anchor-valid > <https://chromestatus.com/features#tags:anchor-valid>, anchors-valid > <https://chromestatus.com/features#tags:anchors-valid> > > *TAG review* > *No information provided* > > *TAG review status* > Not applicable > > *Goals for experimentation* > None > > *Risks* > > > *Interoperability and Compatibility* > This is new support for a value for `position-visibility` so it should not > create compat risks. Shipping this value will improve interop - WebKit > already ships it. > > *Gecko*: No signal > > *WebKit*: Shipped/Shipping > > *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-anchor-position?label=master&label=experimental&aligned&q=position-visibility > > *Flag name on about://flags* > *No information provided* > > *Finch feature name* > CSSPositionVisibilityAnchorValid > > *Rollout plan* > Will ship enabled for all users > > *Requires code in //chrome?* > False > > *Tracking bug* > https://crbug.com/333421963 > > *Estimated milestones* > Shipping on desktop 157 > DevTrial on desktop 157 > Shipping on Android 157 > DevTrial on Android 157 > Shipping on WebView 123 > > *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/5136856479039488?gate=5692419038380032 > > This intent message was generated by Chrome Platform Status > <https://chromestatus.com/>. > > -- > 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/CAM%3DNeDgQ_W7-2FxYgaXc4-r7-vuaq1rexfHn4w4YEEW-Cz0%2BSA%40mail.gmail.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAM%3DNeDgQ_W7-2FxYgaXc4-r7-vuaq1rexfHn4w4YEEW-Cz0%2BSA%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%2Bw971qJCPYANO%3Di10SnkttacN6HFbCSq9Qk_grODH%3DjjPQ%40mail.gmail.com.
