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@ChrisC ChrisC commented Dec 16, 2025

Web Feature docs: https://github.com/web-platform-dx/web-features/blob/main/features/host-context.yml

Notable exclusions from this mapping:

  • css/css-scoping/css-scoping-shadow-host-namespace.html - Title is ":host, :host-context, and default @namespace" - tests both :host and :host-context with namespaces.
  • css/selectors/invalidation/host-context-pseudo-class-in-has.html - primarily about :has()
  • css/selectors/invalidation/host-has-shadow-tree-element-* - primarily about :has()
  • css/selectors/is-where-shadow.html - primarily about :is() and :where()

As of 2025-12-05, the wpt-pr-bot is requesting reviews from code owners for changes to WEB_FEATURES.yml files. To learn more about the purpose of these files, check out this presentation from TPAC 2025, Annotating WPT to Surface the Status of the Platform

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ChrisC commented Dec 16, 2025

cc @foolip @jcscottiii

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