| name | baseline |
| description | Check Baseline status of web features using the Web Platform Status API. Use when the user mentions "baseline", "ベースライン", "ブラウザ対応状況", "browser support", or "web feature status". Checks whether a web feature is widely or newly available, queries browser support details, and finds features not available in a specific browser. |
| argument-hint | <feature name, structured query, or natural language, e.g. 'popover', 'Promise.withResolvers', 'not:firefox', 'Safariで使えないCSS機能'> |
Baseline Web Feature Status Skill
Query the Web Platform Status API to check browser Baseline status of web features.
Query Building
Endpoint: GET https://api.webstatus.dev/v1/features?q={query}
Operators
| Operator | Example |
|---|
available_date:<browser>:<start>..<end> | available_date:chrome:2023-01-01..2024-01-01 |
available_on:<browser> | available_on:chrome |
baseline_date:<start>..<end> | baseline_date:2023-01-01..2024-01-01 |
baseline_status:<status> | baseline_status:widely |
group:<group> | group:css |
name:<keyword> | name:grid |
snapshot:<snapshot> | snapshot:ecmascript-5 |
| (plain text) | grid |
- Statuses:
widely, newly, limited, no_data
- Browsers:
chrome, edge, firefox, safari
- AND: separate with spaces
- OR: join with
+OR+
- Negate: prefix with
-
Natural Language Translation
Translate the user's intent into operators. Show the translated query so the user can learn the syntax.
| User input | API query |
|---|
popover | name:popover |
css nesting | name:nesting |
Promise.withResolvers | name:promise-withresolvers |
not:safari | -available_on:safari |
Safariで使えるけどFirefoxで使えない機能 | available_on:safari -available_on:firefox |
dialogかpopoverの対応状況 | name:dialog+OR+name:popover |
Output Format
Adapt to result count: detail for 5 or fewer, summary table for more.
Example (single feature)
## Feature: Popover API
**Baseline status**: Newly available — supported in all major browsers, but some users may not have updated yet.
**Support dates**:
- Newly available: 2024-04-17
**Browser support**:
- Chrome: 114 (2023-05-30)
- Edge: 114 (2023-06-02)
- Firefox: 125 (2024-04-16)
- Safari: 17 (2023-09-18)
**Daily usage (Chrome)**: 8.2%
For 5+ results, use a summary table (feature name + baseline status). Limit to first 20, showing total count.
Constraints
- If the API returns empty results or an error, suggest alternative queries
- If argument is empty, ask the user for a feature name or query
- Usage
daily is a fraction (0–1); display as percentage
- Timeout after 10 seconds
- Maximum 3 concurrent API requests
