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Propagate namespaces through functional selectors - #528
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wieslawsoltes
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September 19, 2026 01:35
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Namespace context reached top-level type and attribute selectors but was lost when functional pseudo-class arguments were reparsed as strings. This stores an immutable prepared nested selector list on compiled pseudos and recursively compiles
:is(),:where(),:not(), and anchored:has()with the stylesheet namespace context, Servo-authored specificity, a depth limit of 32, and a shared 4,096-selector budget.Matching, query hosts, and invalidation consume the same payload, so cache identity and namespace resolution cannot diverge. Unknown-prefix-only payloads fail closed while valid forgiving-list arms survive. Authored native and WPT sources cover default/prefixed/any/empty namespaces, nested
:has(), invalidation, cache separation, ownership/adoption, specificity, and bounds.Only
git diff --checkran under the current implementation-first policy. Builds, tests, WPT execution, performance, memory, lifecycle, product, and complete CI evidence remain deferred. The legacy non-Servo fallback retains its existing string-recursive path.Closes #520
Progresses #239