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qa-cratis-docs

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更新时间2026年6月7日 11:21

Use this skill to visually QA rendered docs site pages after changes to source files under `Documentation/**` — screenshot pages headless in light AND dark, evaluate how they look against the aspire.dev bar, check diagrams/tables/code blocks render, and diagnose layout-shift ("flicker"/"twitch"/"pop") bugs. Trigger when someone asks to screenshot the docs, check how a docs page looks, review the docs visually, verify a diagram or table renders, compare the docs to aspire.dev, or investigate a flicker/jump/layout-shift on the docs site.

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来源

Cratis

Cratis/Arc

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在 Manus 中运行

Visual & layout QA for the docs site

Scope this skill to visual checks for product or contributing docs whose source lives under Documentation/**. Site-level pages in Documentation/web are owned by the Documentation repo.

shot-scraper/Playwright aren't dependencies, but Chrome is. Use the committed Documentation/web/scripts/screenshot.mjs (drives system Chrome over CDP) — it captures light or dark, full-page, with client-side rendering settled.

Capture

cd Documentation/web && npm run dev        # serve at http://localhost:4321 (keep it running)
node scripts/screenshot.mjs http://localhost:4321/chronicle/concepts/event-source/ /tmp/es-dark.png dark
node scripts/screenshot.mjs http://localhost:4321/chronicle/concepts/event-source/ /tmp/es-light.png light

Then Read the PNG to evaluate it. Crop/zoom with the sharp already in node_modules (PIL/ImageMagick aren't installed):

node -e "require('sharp')('/tmp/es-dark.png').extract({left:300,top:600,width:900,height:500}).resize({width:1400}).toFile('/tmp/crop.png')"

Build the page list from web/src/generated/topics.json + the site-level slugs. The bar is aspire.dev (~/src/repos/aspire.dev/src/frontend) — study its site.css/mermaid.css for the depth cues (gradient glows, framed diagrams, lifted cards) that cratis.css is built from.

What to check on each page

Diagrams themed and correctly sized in both themes (pre-rendered SVG — should be present immediately, no pop).
Tables render as real tables (not raw | pipes — that's the GFM/MDX bug).
Code blocks not over-indented (no spurious leading whitespace in the source snippet) and lifted off the page.
Hero / cards have depth (glow, lift), inline code is a brand-tinted chip.
Light AND dark both read cleanly.

Diagnosing a flicker / twitch / layout-shift

The cause is almost always one of: font swap (fixed — font-display: optional + preload in Head.astro), client-side rendering settling, or Mermaid (fixed — build-time pre-render). To measure:

Inject a buffered layout-shift PerformanceObserver via CDP Page.addScriptToEvaluateOnNewDocument and sample document.documentElement height every ~16ms after navigate; print the timeline.
Use a fresh --user-data-dir for a cold (uncached) load; reuse it for a warm load. Many shifts only show cold.
For scroll-restoration flashes: scroll down, Page.reload, sample window.scrollY — if it lands short, content above is rendering late.
Run all CDP scripts serially — they collide on the debug port.

Caveats

Restart npm run dev after running npm run check — the gate's re-sync degrades a live dev server (pages 500, tables vanish). A degraded dev server makes screenshots lie; restart and re-verify before trusting a "broken" result.
The Astro dev toolbar appears mid-page in full-page captures — it's a dev-only overlay, not a real element.
prefers-color-scheme emulation can trigger astro-mermaid's theme observer on any client-rendered fallback diagram; pre-rendered diagrams are unaffected.

→ Rendering internals live in the Documentation repo.

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name

qa-cratis-docs

description

Visual & layout QA for the docs site

Scope this skill to visual checks for product or contributing docs whose source lives under Documentation/**. Site-level pages in Documentation/web are owned by the Documentation repo.

Capture

cd Documentation/web && npm run dev        # serve at http://localhost:4321 (keep it running)
node scripts/screenshot.mjs http://localhost:4321/chronicle/concepts/event-source/ /tmp/es-dark.png dark
node scripts/screenshot.mjs http://localhost:4321/chronicle/concepts/event-source/ /tmp/es-light.png light

Then Read the PNG to evaluate it. Crop/zoom with the sharp already in node_modules (PIL/ImageMagick aren't installed):

node -e "require('sharp')('/tmp/es-dark.png').extract({left:300,top:600,width:900,height:500}).resize({width:1400}).toFile('/tmp/crop.png')"

What to check on each page

Diagrams themed and correctly sized in both themes (pre-rendered SVG — should be present immediately, no pop).
Tables render as real tables (not raw | pipes — that's the GFM/MDX bug).
Code blocks not over-indented (no spurious leading whitespace in the source snippet) and lifted off the page.
Hero / cards have depth (glow, lift), inline code is a brand-tinted chip.
Light AND dark both read cleanly.

Diagnosing a flicker / twitch / layout-shift

Inject a buffered layout-shift PerformanceObserver via CDP Page.addScriptToEvaluateOnNewDocument and sample document.documentElement height every ~16ms after navigate; print the timeline.
Use a fresh --user-data-dir for a cold (uncached) load; reuse it for a warm load. Many shifts only show cold.
For scroll-restoration flashes: scroll down, Page.reload, sample window.scrollY — if it lands short, content above is rendering late.
Run all CDP scripts serially — they collide on the debug port.

Caveats

Restart npm run dev after running npm run check — the gate's re-sync degrades a live dev server (pages 500, tables vanish). A degraded dev server makes screenshots lie; restart and re-verify before trusting a "broken" result.
The Astro dev toolbar appears mid-page in full-page captures — it's a dev-only overlay, not a real element.
prefers-color-scheme emulation can trigger astro-mermaid's theme observer on any client-rendered fallback diagram; pre-rendered diagrams are unaffected.

→ Rendering internals live in the Documentation repo.