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web-static

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更新日2026年5月10日 16:51

Build modern static websites using semantic HTML and CSS without external dependencies or build systems

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AdamBien

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Hard Constraints

No JavaScript — no <script> tags, no inline event handlers, no .js files
No external dependencies — no frameworks, libraries, CDNs, or package managers
No build systems — no transpilation, bundling, preprocessing, Sass, Less, or Tailwind
No inline styles — all CSS in separate .css files
Baseline 2025 — only use CSS features widely available across modern browsers

HTML Rules

Semantic elements over generic <div>/<span> — use <header>, <nav>, <main>, <article>, <section>, <aside>, <footer>, <figure>, <time>, <address>
One <main> per page
Proper heading hierarchy (h1 → h2 → h3, no skipping)
lang attribute on <html>
alt on all images (empty alt="" for decorative)
aria-label on <nav> when multiple navs exist
<label> associated with every form input
Skip link for keyboard users
Use <a> for navigation, not buttons
Use <br> only for line breaks in content, never for spacing

CSS Rules

Use CSS custom properties for theming (--color-primary, --spacing-unit, etc.)
Use logical properties (margin-block, padding-inline, inline-size, block-size)
Mobile-first responsive design with min-width breakpoints
Use modern features: CSS nesting, container queries, cascade layers, subgrid, oklch() colors
Use clamp() for fluid typography
Prefer gap over margins for spacing in flex/grid layouts
Include prefers-reduced-motion: reduce and prefers-color-scheme: dark media queries
Use content-visibility: auto for off-screen sections
WCAG AA color contrast minimum (4.5:1)
Always maintain visible :focus-visible indicators
Use @supports for feature detection when applying Baseline Newly Available features, providing a graceful fallback for older browsers
When recommending a newer CSS feature, cite its Baseline status (Widely Available, Newly Available, or Limited) so the reader can judge browser support

CSS Reset Baseline

Every project starts with:

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: system-ui, -apple-system, sans-serif; line-height: 1.5; }

Interactive Patterns (CSS-Only)

When interactivity is needed, use these approaches — never JavaScript:

Accordion: <details>/<summary>
Modal: :target pseudo-class with anchor links
Tabs: hidden radio buttons with :checked + sibling selectors
Dropdown menu: :hover + :focus-within
Mobile hamburger: hidden checkbox with :checked + sibling selectors
Form styling: appearance: none to customize native controls

Performance

loading="lazy" on below-fold images
<picture> with WebP sources for responsive images
Preload critical CSS and fonts
contain: layout style paint on repeated components

Project Structure

project/
├── index.html
├── css/
│   └── style.css
├── images/
├── fonts/
└── icons/

For small sites, a flat structure (HTML + single style.css + images/) is acceptable.

What NOT to Do

Do not use tables for layout
Do not use <br> for spacing
Do not use non-semantic <div> when a semantic element exists
Do not use onclick or any inline event handlers
Do not add JavaScript for interactions achievable with CSS
Do not use CSS frameworks or preprocessors

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name	web-static
description	Build modern static websites using semantic HTML and CSS without external dependencies or build systems
argument-hint	[description of the website or page to build]

Build or maintain a static website using $ARGUMENTS. Apply all rules below strictly.

Hard Constraints

No JavaScript — no <script> tags, no inline event handlers, no .js files
No external dependencies — no frameworks, libraries, CDNs, or package managers
No build systems — no transpilation, bundling, preprocessing, Sass, Less, or Tailwind
No inline styles — all CSS in separate .css files
Baseline 2025 — only use CSS features widely available across modern browsers

HTML Rules

Semantic elements over generic <div>/<span> — use <header>, <nav>, <main>, <article>, <section>, <aside>, <footer>, <figure>, <time>, <address>
One <main> per page
Proper heading hierarchy (h1 → h2 → h3, no skipping)
lang attribute on <html>
alt on all images (empty alt="" for decorative)
aria-label on <nav> when multiple navs exist
<label> associated with every form input
Skip link for keyboard users
Use <a> for navigation, not buttons
Use <br> only for line breaks in content, never for spacing

CSS Rules

Use CSS custom properties for theming (--color-primary, --spacing-unit, etc.)
Use logical properties (margin-block, padding-inline, inline-size, block-size)
Mobile-first responsive design with min-width breakpoints
Use modern features: CSS nesting, container queries, cascade layers, subgrid, oklch() colors
Use clamp() for fluid typography
Prefer gap over margins for spacing in flex/grid layouts
Include prefers-reduced-motion: reduce and prefers-color-scheme: dark media queries
Use content-visibility: auto for off-screen sections
WCAG AA color contrast minimum (4.5:1)
Always maintain visible :focus-visible indicators
Use @supports for feature detection when applying Baseline Newly Available features, providing a graceful fallback for older browsers
When recommending a newer CSS feature, cite its Baseline status (Widely Available, Newly Available, or Limited) so the reader can judge browser support

CSS Reset Baseline

Every project starts with:

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: system-ui, -apple-system, sans-serif; line-height: 1.5; }

Interactive Patterns (CSS-Only)

When interactivity is needed, use these approaches — never JavaScript:

Accordion: <details>/<summary>
Modal: :target pseudo-class with anchor links
Tabs: hidden radio buttons with :checked + sibling selectors
Dropdown menu: :hover + :focus-within
Mobile hamburger: hidden checkbox with :checked + sibling selectors
Form styling: appearance: none to customize native controls

Performance

loading="lazy" on below-fold images
<picture> with WebP sources for responsive images
Preload critical CSS and fonts
contain: layout style paint on repeated components

Project Structure

project/
├── index.html
├── css/
│   └── style.css
├── images/
├── fonts/
└── icons/

For small sites, a flat structure (HTML + single style.css + images/) is acceptable.

What NOT to Do

Do not use tables for layout
Do not use <br> for spacing
Do not use non-semantic <div> when a semantic element exists
Do not use onclick or any inline event handlers
Do not add JavaScript for interactions achievable with CSS
Do not use CSS frameworks or preprocessors