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Pull request overview
Adds support for the Selectors Level 4 :lang() pseudo-class to the selector engine, addressing issue #1302 and enabling language-based matching via lang / xml:lang (with inheritance).
Changes:
- Implement
:lang(...)as a compiled filter, including RFC 4647 “extended filtering” semantics and ancestor language inheritance. - Add a dedicated
:langtest suite covering exact match, prefix match, case-insensitivity, inheritance/override, comma-separated ranges, wildcard primary subtag, andxml:lang.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.
| File | Description |
|---|---|
| test/pseudo-classes.ts | Adds new test cases validating :lang() behavior across common and advanced matching scenarios. |
| src/pseudo-selectors/filters.ts | Implements :lang filtering logic and RFC 4647 extended filtering helper. |
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Implementing https://www.w3.org/TR/selectors-4/#the-lang-pseudo
Fixes #1302