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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