Vanilla Web (HTML/CSS/JS)

Required constraints (non-negotiables)

• HTML/CSS/JS only (no framework)
• Use modular JS (ESM)
• Prefer small, focused functions and pure utilities
• Avoid global state

When to activate this skill (user asks for)

• Vanilla JS / plain HTML/CSS/JS / static page / efficient
• no framework, no React/Angular/Vue
• small UI components (modals, tabs, dropdown, form validation) built directly in the DOM
• refactors to remove framework dependencies or reduce JS complexity

Output expectations