I do intend to fix that, but I I'm not holding up shipping on that issue,
given that Chrome/WebKit have been shipping with differing behavior on that
since forever (and given that this is a legacy prefixed keyword).


On Sat, Oct 11, 2025, 12:39 AM 一丝 <[email protected]> wrote:

> I noticed that `-webkit-fill-available` has been enabled in Firefox
> 145[1], but it seems a bug 1920634 [2] has been overlooked. Is there still
> time to fix it in 145?
>
>
> [1]: https://bugzilla.mozilla.org/show_bug.cgi?id=1988938
>
> [2]: https://bugzilla.mozilla.org/show_bug.cgi?id=1920634
>
> 在2025年9月18日星期四 UTC+8 00:36:20<[email protected]> 写道:
>
>> As of today (2025-09-17), I intend to turn on support for the CSS
>> '-webkit-fill-available' sizing keyword, specifically in the 'height' and
>> 'width' properties. (Support for the keyword in other properties will ship
>> soon but separately, per note at the bottom of this message.)
>>
>> It has been developed behind the '
>> layout.css.webkit-fill-available.enabled' preference. Other
>> WebKit/Blink-based browsers have already been shipping this legacy prefixed
>> keyword for over a decade.
>>
>> *Bug to turn on by default:*
>> https://bugzilla.mozilla.org/show_bug.cgi?id=1988938
>>
>> *Standard:* https://drafts.csswg.org/css-sizing-4/#stretch-fit-sizing
>>
>> (Note on the standard/spec: this webkit-prefixed keyword is a legacy
>> alias for what is now standardized as 'stretch' in that spec.  Gecko and
>> WebKit have not yet shipped that standardized 'stretch' keyword, but
>> there's strong webcompat dependence on this legacy webkit-prefixed keyword
>> keyword, particularly in the 'width' and 'height' properties - hence the
>> need to ship that version as soon as possible.)
>> *This feature was previously discussed in this "Intent to prototype"
>> thread:*
>>
>> https://groups.google.com/a/mozilla.org/g/dev-platform/c/-pMSV-kgUjA/m/VRL09R1NAAAJ
>>
>> Note: In the coming weeks, I also intend to enable support for this
>> prefixed keyword in *other* properties (beyond 'height' and 'width') as
>> well - that support is guarded by the
>> "layout.css.webkit-fill-available.all-size-properties.enabled" preference
>> (added in https://bugzilla.mozilla.org/show_bug.cgi?id=1988301 ).  And I
>> intend to enable support for the standardized keyword name ('stretch') by
>> the end of the year.  I'll send separate intent-to-ship messages for those
>> changes.
>>
>

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