frontend-impl-web-components
Installation
SKILL.md
Frontend Impl : Web Components
Authoritative reference for the standards-based component model : custom elements + shadow DOM + slots + declarative shadow DOM + form-associated custom elements. Framework-agnostic by design. Use for distributable UI primitives that must work in every framework and none.
Quick Reference
Baseline status
| Feature | Baseline | Source |
|---|---|---|
Custom elements (customElements.define) |
Widely Available | MDN : Web Components (verified 2026-05-19) |
Shadow DOM (attachShadow) |
Widely Available | MDN : ShadowRoot (verified 2026-05-19) |
Declarative Shadow DOM (<template shadowrootmode>) |
Newly Available (2024) | MDN : <template> (verified 2026-05-19) |
ElementInternals (form-associated) |
Widely Available since March 2023 | MDN : ElementInternals (verified 2026-05-19) |
| Scoped Custom Element Registries | Limited / experimental | WHATWG HTML : custom elements (verified 2026-05-19) |