[WICG/webcomponents] Add selector match custom element (Issue #1105)

mantou132 created an issue (WICG/webcomponents#1105)

e.g: `:custom-element`

User case:
- `@scope (my-element) to (:custom-element) {...}`
- Tailwind base css: `:not(:custom-element) { ... }`

https://github.com/w3c/csswg-drafts/issues/10407

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