frontend-core-web-standards-baseline
Installation
SKILL.md
Frontend Core : Web Standards and Baseline
Authoritative reference for spec-lookup discipline and Baseline-aware shipping decisions. Every other skill in this package depends on the rules defined here.
Quick Reference
Baseline taxonomy (verified against web.dev : Baseline (verified 2026-05-19))
| Status | Definition | Action |
|---|---|---|
| Limited Availability | Not yet supported across all four core engines | Behind explicit opt-in only. Document as experimental. |
| Newly Available | Supported by Chrome (desktop + Android), Edge, Firefox (desktop + Android), and Safari (macOS + iOS) and interoperable | Gate with @supports and provide a fallback. |
| Widely Available | 30 months have elapsed since Newly Available date | Safe for most production sites. No fallback required. |
Annual cohorts group features by the year they reached Newly Available : Baseline 2024, Baseline 2025. Cohort labels are convenient targets ("we ship Baseline 2024") but the per-feature taxonomy above is the authoritative gate.