This is only the initial release (think of it as an MVP), so yeah, expect further updates to follow soon.
Not a fully detailed list (Jonathan may be able to give a more comprehensive summary), but regarding your questions: - position-try-fallbacks are supported. - anchor-center alignment is going to be supported in the initial release (patch is in bug 1909339 <https://bugzil.la/1909339>). - Similarly there are a couple bugs regarding position-area shrink-wrapping and such that we're dealing with and plan to include in the initial release. - Something that is *not* supported is the style/layout interleaving behavior (which allows you to transition between anchor() values). That is tracked in bug 1924226 <https://bugzil.la/1924226>. - Similarly, position-try-order is *not* supported for now, tracked in bug 1989059 <https://bugzil.la/1989059>. - Pseudo-elements can be anchored, is that what you mean? Implicit anchoring is changing a bit (see this CSSWG issue <https://github.com/w3c/csswg-drafts/issues/13067>), so we don't think implicit anchoring blocks the initial release. Thanks, -- Emilio On Wed, Dec 3, 2025 at 7:33 AM 一丝 <[email protected]> wrote: > It's great to see Firefox shipping CSS anchors, but I hope they can reduce > some compatibility issues before shipping. > > Is position-try-fallbacks included in this release? > https://bugzilla.mozilla.org/show_bug.cgi?id=1987954 > It appears many features remain unimplemented in Firefox; it would be > helpful to have a list detailing them. > > Chrome 144 introduced a series of updates to anchor behavior; Firefox > should also have a roadmap. > https://chromium-review.googlesource.com/c/chromium/src/+/7076551 > > Additionally, I believe ship should provide full support for > pseudo-elements beforehand, as this is a common use case for CSS anchors. > - https://bugzilla.mozilla.org/show_bug.cgi?id=1993698#c2 > - https://bugzilla.mozilla.org/show_bug.cgi?id=1993699 > - Compatibility issues with the `position-anchor` and `anchor-center` > keywords. > ```html > data:text/html;charset=UTF-8,<!DOCTYPE html> > <style> > .anchor { > anchor-name: --a; > background: pink; > width: 50px; > height: 50px; > } > .tooltip { > font-family: arial, sans-serif; > background: green; > border: 2px solid red; > margin: 0; > position: fixed; > position-area: bottom; > position-anchor: --a; > justify-self: anchor-center; > } > </style> > <div class="anchor"></div> > <div class="tooltip"> > tooltips tooltips > </div> > ``` > > > > 在2025年12月3日星期三 UTC+8 05:45:31<Jonathan Watt> 写道： > >> As of today (2025-12-02) I intend to turn CSS Anchor Positioning on by >> default. >> It has been developed behind the layout.css.anchor-positioning.enabled >> preference. This feature has shipped in other WebKit/Blink-based >> browsers. >> >> Bug to turn on by default: >> https://bugzilla.mozilla.org/show_bug.cgi?id=1988225 >> >> Standard: https://drafts.csswg.org/css-anchor-position-1/ >> >> This feature was previously discussed in this "Intent to prototype" >> thread: >> >> https://groups.google.com/a/mozilla.org/g/dev-platform/c/4cbytMKbHtg/m/dUfWuHB0AAAJ >> > -- > You received this message because you are subscribed to the Google Groups " > [email protected]" 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/mozilla.org/d/msgid/dev-platform/4c108f6b-7db8-44ce-9c58-17193ca027a7n%40mozilla.org > <https://groups.google.com/a/mozilla.org/d/msgid/dev-platform/4c108f6b-7db8-44ce-9c58-17193ca027a7n%40mozilla.org?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "[email protected]" 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/mozilla.org/d/msgid/dev-platform/CAFhp-qeKHF4nCFSjkRVuL_XNjgd8DHaARV2G4QJaAQsuuav92A%40mail.gmail.com.
