Contact emails

rzan...@igalia.com


       Explainer

https://github.com/rogerzanoni/docs/tree/main/lang-level-4


       Specification

https://www.w3.org/TR/selectors-4/#the-lang-pseudo


       Summary

The :lang CSS pseudo-class currently matches elements based on level 3 specs logic, which describes a prefix-matching rule to match language values. The level 4 spec changes this matching logic, supporting argument-list and language range matching (according to the specs of the extended filtering operation from RFC4647 - Matching of language tags - section 3.3.2, and the simple priority list matching described on section 2.3)



       Blink component

Blink>CSS <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3ECSS>


       Search tags

css <https://chromestatus.com/features#tags:css>,lang <https://chromestatus.com/features#tags:lang>,pseudo <https://chromestatus.com/features#tags:pseudo>


       TAG review

Just extends functionality of the existing :lang selector.


       TAG review status

Not applicable


       Risks



       Interoperability and Compatibility

This change mostly extends :lang functionality and don't change existing behavior, except for adding implicit wildcard matching, which breaks one of the existing level 3 tests: https://wpt.fyi/results/css/selectors/i18n/css3-selectors-lang-005.html



/Gecko/: No signal (https://bugzilla.mozilla.org/show_bug.cgi?id=1121792)

/WebKit/: Shipped/Shipping (https://webkit.org/status/#feature-css-selector-:lang)

/Web developers/: No signals

/Other signals/: CSSWG consensus to ship documented inhttps://www.w3.org/TR/css-2017/#experimental(CSSWG includes reps from all major browser vendors)


       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

Automatically supported, same as other pseudo-elements.



       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 byweb-platform-tests
       
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?

No


       Flag name



       Requires code in //chrome?

False


       Tracking bug

https://bugs.chromium.org/p/chromium/issues/detail?id=1281157


       Estimated milestones

No milestones specified



       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).



       Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5071058079055872


       Links to previous Intent discussions

Intent to prototype:https://groups.google.com/a/chromium.org/d/msgid/blink-dev/dd1cdecb-3bd5-cf6c-bf5c-120735d36ee6%40igalia.com


This intent message was generated byChrome Platform Status <https://chromestatus.com/>.

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