Safari has claimed to implement rlh, but nothing else I guess. None of them
are in Firefox.

On Tue, Jan 10, 2023 at 11:11 AM Philip Jägenstedt <foo...@chromium.org>
wrote:

> I see the Gecko issue has now been resolved as positive, which is great.
>
> Are any of these units already supported in Firefox or Safari, or would we
> be the first to ship all of them? (I took a look at one test and have a
> guess, but just as well to ask.)
>
> On Sat, 7 Jan 2023 at 01:48 Mike Taylor <miketa...@chromium.org> wrote:
>
>> On 1/5/23 5:07 AM, 'Daniil Sakhapov' via blink-dev wrote:
>>
>> Contact emails sakha...@chromium.org
>>
>> Specification https://www.w3.org/TR/css-values-4/#font-relative-lengths
>>
>> Summary
>>
>> Allows usage of root font units. Currently only 'rem' is supported in
>> Blink. This feature supports root element variants of ex, ch, ic, and lh
>> too.
>>
>> Blink component Blink>CSS
>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>
>>
>> Search tags rlh <https://chromestatus.com/features#tags:rlh>, ric
>> <https://chromestatus.com/features#tags:ric>, rch
>> <https://chromestatus.com/features#tags:rch>, rex
>> <https://chromestatus.com/features#tags:rex>, root font
>> <https://chromestatus.com/features#tags:root%20font>
>>
>> TAG review The feature is not fundamental and only implements an
>> existing standard
>>
>> Note that CSS Values and Units Level 4 is not yet a standard, but a working
>> draft <https://www.w3.org/standards/types#WD>.
>>
>> That said, it seems the TAG recently reviewed the draft spec and was
>> satisfied with it:
>>
>> https://github.com/w3ctag/design-reviews/issues/781
>>
>>
>> TAG review status Not applicable
>>
>> Risks
>>
>>
>> Interoperability and Compatibility
>>
>> *Gecko*: No signal (
>> https://github.com/mozilla/standards-positions/issues/725)
>>
>> *WebKit*: No signal (
>> https://github.com/WebKit/standards-positions/issues/112)
>>
>> *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
>>
>>
>> Debuggability
>>
>> The new units should be automatically supported by devtools. No need for
>> any changes.
>>
>> Will this feature be supported on all six Blink platforms (Windows, Mac,
>> Linux, Chrome OS, 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/css/css-values/rlh-invalidation.html
>> https://wpt.fyi/css/css-values/ric-invalidation.html
>> https://wpt.fyi/css/css-values/rch-invalidation.html
>> https://wpt.fyi/css/css-values/rex-invalidation.html
>> https://wpt.fyi/css/css-values/lh-rlh-on-root-001.html
>>
>> https://wpt.fyi/css/css-typed-om/stylevalue-subclasses/numeric-objects/cssUnitValue.html
>> https://wpt.fyi/css/css-contain/container-queries/font-relative-units.html
>>
>> https://wpt.fyi/css/css-contain/container-queries/font-relative-units-dynamic.html
>>
>> Flag name #enable-experimental-web-platform-features /
>> CSSNewRootFontUnits (Blink)
>>
>> Requires code in //chrome? False
>>
>> Tracking bug
>> https://bugs.chromium.org/p/chromium/issues/detail?id=1381037
>>
>> Estimated milestones
>> DevTrial on desktop 111
>> DevTrial on Android 111
>> Link to entry on the Chrome Platform Status
>> https://chromestatus.com/feature/5073969265246208
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