[csswg-drafts] Pull Request: [selectors-4] Canonicalize into extlang form prior to :lang() matching

frivoal has just labeled a pull request from frivoal for https://github.com/w3c/csswg-drafts as "Needs Testcase (WPT)":

== [selectors-4] Canonicalize into extlang form prior to :lang() matching ==
Fixes #4154

See https://github.com/w3c/csswg-drafts/pull/4212


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Received on Thursday, 29 January 2026 16:55:14 UTC