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Web Prototype Skill
Produce a single, self-contained HTML prototype using the bundled seed and layout library — not by writing CSS from scratch. The seed already encodes good defaults (typography, spacing, accent budget). Your job is to compose it.
Resource map
web-prototype/
├── SKILL.md ← you're reading this
├── assets/
│ └── template.html ← seed: tokens + class system + chrome (READ FIRST)
└── references/
├── layouts.md ← 8 paste-ready section skeletons
└── checklist.md ← P0/P1/P2 self-review
Workflow
Step 0 — Pre-flight (do this once before writing anything)
Read assets/template.html end-to-end — at minimum through the <style> block. The class inventory at the top of references/layouts.md lists every class that must be defined there; if one is missing, add it to <style> rather than re-defining it inline on every section.
Read references/layouts.md so you know which section skeletons exist. Don't write a section type that isn't covered — pick the closest layout and adapt.
Read the active DESIGN.md (already injected into your system prompt). Map its colors to the six :root variables in the seed; don't introduce new tokens.
Step 1 — Copy the seed
Copy assets/template.html to the project root as index.html. Replace the six :root variables with the active design system's tokens. Replace the page <title> and the topnav brand.
Step 2 — Plan the section list
Pick layouts before writing copy. Default rhythms (from layouts.md):
Page kind
Default rhythm
Landing
1 hero → 3 features → 4 stats or 5 quote → custom split → 6 cta
Marketing / editorial
1 hero-center → 7 log list → 6 cta
Pricing
1 hero-center → 8 comparison table → 6 cta
Docs index
1 hero-center → 7 log list (sections of docs) → 6 cta
State the chosen list in one sentence to the user before writing — they can redirect cheaply now and not after 200 lines of HTML.
Step 3 — Paste and fill
For each chosen layout, copy the <section> block from layouts.md into <main id="content"> of your index.html. Replace bracketed [REPLACE] strings with real, specific copy from the user's brief. No filler — if a slot is empty, the section is the wrong choice; pick a different layout.
Step 4 — Self-check
Run through references/checklist.md top to bottom. Every P0 item must pass before you move on. P1 items should pass; P2 are bonus.
Step 5 — Emit the artifact
Wrap index.html in <artifact> tags. One sentence before describing what's there. Stop after </artifact>.
Hard rules (the seed protects most of these — don't fight it)
Single accent, used at most twice per screen. Eyebrow + primary CTA is the default budget.
Display font is serif (Iowan Old Style / Charter / Georgia in the seed). Sans for body. Mono for numerics, captions, eyebrows.
Image placeholders, not external URLs. Use the .ph-img class — never link to a stock photo CDN.
Mobile reflow already works via the seed's media query at 920px. Don't break it by adding fixed widths.
data-od-id on every <section> so comment mode can target it.
Output contract
<artifact identifier="kebab-case-slug" type="text/html" title="Human Title">
<!doctype html>
<html>...</html>
</artifact>
One sentence before the artifact. Nothing after.don't have the plugin yet? install it then click "run inline in claude" again.