Modern Web Browser Compatibility + Baseline Awareness SKILL.md skillA
Modern Web Browser Compatibility + Baseline Awareness from s977043/river-review is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add s977043/river-review/Modern Web Browser Compatibility + Baseline Awareness@v0.1.0Pins v0.1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- s977043/river-review
- Path
skills/midstream/modern-web-browser-compat/SKILL.md- Versions recorded
- 1
- Latest version
- v0.1.0, committed Jun 29, 2026
- Size
- 7,042 bytes
- Repository stars
- 7
- License
- MIT
新しい Web API / CSS の利用追加に対し、Baseline 状態とブラウザ互換性 / progressive enhancement の有無を suggestion で示す。.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
## Goal / 目的
- 新しい Web API / CSS プロパティを差分で導入したときに、Baseline 状態 (Newly available / Widely available / Limited availability) とブラウザサポートを確認する起点を示す。
- progressive enhancement / feature detection / graceful degradation の有無を suggestion で問いかける。
- ブラウザサポート方針が repo に明文化されているなら、その方針との整合を優先する。
## Non-goals / 扱わないこと
- 完全な caniuse データの代替（実際のサポート % は MDN / web-features を参照する起点として扱う）。
- polyfill 推奨そのもの（重い polyfill 追加は別レビュー / 別議論）。
- ブラウザサポート対象範囲のチーム合意形成（人間レビューへ）。
## False-positive guards / 抑制条件
- repo に「Modern browsers only」「Evergreen browser support」等の明示があるなら、Widely available 級の API は指摘しない。
- transpiler / bundler (Babel / SWC) が target ブラウザを設定している場合、JS 構文系は対象外（CSS / Web API は別問題）。
- 既に `@supports` / `if ('xxx' in window)` / `try-catch` 等の feature detection が含まれている差分は指摘しない。
- progressive enhancement の fallback がコメント・docs で明示されている場合は指摘しない。
## Rule / ルール
### Baseline 状態の確認
- **Newly available (緑、新規)**: 過去 30 ヶ月未満で全モダンブラウザに到達した機能。利用は OK だが、Safari 旧バージョン / IE 互換要件があれば fallback を確認。
- **Widely available (青、安定)**: 30 ヶ月以上経過し全モダンブラウザで安定。基本的に suggestion なし。
- **Limited availability (赤、未到達)**: 一部ブラウザで未実装 / experimental flag 越し。**必ず fallback / feature detection を提案する**。
### JavaScript / Web API
…Read the whole file at its exact version.
How to install
mdr add s977043/river-review/Modern Web Browser Compatibility + Baseline Awareness@sha256:9a90744781f3fa45The line at the top of this page pins the label v0.1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ottijnrmlkh5tfwa)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jun 29, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7042 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
s977043/river-review · 7 stars · license MIT · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ottijnrmlkh5tfwa GET https://markdownregistry.com/api/v1/resolve?ref=s977043/river-review/Modern Web Browser Compatibility + Baseline Awareness GET https://markdownregistry.com/api/v1/blob/9a90744781f3fa45dd760b58271ec886e3f662c7702ffacfba9c8e38fc666a58
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from s977043/river-review
Every file in s977043/river-review