ui-design
UI/UX and frontend design best practices guidelines (formerly frontend-design). This skill should be used when writing, reviewing, or designing frontend code to ensure accessibility, performance, and usability. Triggers on tasks involving HTML structure, CSS styling, responsive layouts, form design, animations, or accessibility improvements.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/pproenca/dot-skills --skill ui-design- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads ui-design automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
UI/UX Best Practices Frontend Design
Comprehensive UI/UX and frontend design best practices guide. Contains 42 rules across 8 categories, prioritized by impact to guide accessible, performant, and user-friendly interface development.
When to Apply
Reference these guidelines when:
- Structuring HTML for accessibility and semantics
- Writing CSS for responsive layouts and visual hierarchy
- Optimizing images and fonts for Core Web Vitals
- Designing forms with proper validation and error handling
- Adding animations and interactive elements
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Accessibility & WCAG Compliance | CRITICAL | access- |
| 2 | Core Web Vitals Optimization | CRITICAL | cwv- |
| 3 | Visual Hierarchy & Layout | HIGH | layout- |
| 4 | Responsive & Mobile-First Design | HIGH | resp- |
| 5 | Typography & Font Loading | MEDIUM-HIGH | typo- |
| 6 | Color & Contrast | MEDIUM | color- |
| 7 | Forms & Validation UX | MEDIUM | form- |
| 8 | Animation & Performance | LOW-MEDIUM | anim- |
Quick Reference
1. Accessibility & WCAG Compliance (CRITICAL)
access-semantic-html- Use semantic HTML elements for screen readersaccess-keyboard-navigation- Ensure full keyboard navigationaccess-focus-indicators- Provide visible focus indicatorsaccess-alt-text- Provide meaningful alt text for imagesaccess-aria-labels- Use ARIA labels for icon-only controlsaccess-target-size- Ensure minimum touch target size (24×24px)access-heading-hierarchy- Maintain logical heading hierarchy
2. Core Web Vitals Optimization (CRITICAL)
cwv-optimize-lcp- Optimize Largest Contentful Paint under 2.5scwv-minimize-cls- Minimize Cumulative Layout Shift under 0.1cwv-improve-inp- Improve Interaction to Next Paint under 200mscwv-responsive-images- Serve responsive images with srcsetcwv-lazy-load-offscreen- Lazy load offscreen images and iframescwv-critical-css- Inline critical CSS and defer the rest
3. Visual Hierarchy & Layout (HIGH)
layout-visual-hierarchy- Establish clear visual hierarchylayout-whitespace- Use whitespace to improve readabilitylayout-f-pattern- Design for F-pattern reading behaviorlayout-grid-system- Use a consistent grid systemlayout-single-cta- Limit to one primary CTA per screenlayout-proximity-grouping- Group related elements with proximity
4. Responsive & Mobile-First Design (HIGH)
resp-mobile-first- Design mobile-first with min-width queriesresp-fluid-typography- Use fluid typography with clamp()resp-container-queries- Use container queries for componentsresp-touch-targets- Size touch targets for mobile (44×44px)resp-viewport-meta- Configure viewport meta tag correctly
5. Typography & Font Loading (MEDIUM-HIGH)
typo-font-display- Use font-display to control loading behaviortypo-preload-fonts- Preload critical web fontstypo-readable-line-length- Constrain line length (45-75ch)typo-line-height- Set appropriate line height (1.5-1.7)typo-system-font-stack- Use system font stack for UI elements
6. Color & Contrast (MEDIUM)
color-contrast-ratio- Meet WCAG contrast ratio requirements (4.5:1)color-not-only-indicator- Never use color alone to convey informationcolor-dark-mode- Support dark mode with prefers-color-schemecolor-semantic-palette- Use semantic color names in design tokens
7. Forms & Validation UX (MEDIUM)
form-inline-validation- Use inline validation after field blurform-error-messages- Write actionable error messagesform-labels-above- Place labels above input fieldsform-input-types- Use correct HTML input types for mobileform-autocomplete- Enable browser autocomplete with correct attributes
8. Animation & Performance (LOW-MEDIUM)
anim-gpu-properties- Animate only GPU-accelerated propertiesanim-will-change- Use will-change sparingly for animation hintsanim-reduced-motion- Respect user motion preferencesanim-duration-easing- Use appropriate animation duration and easing
How to Use
Read individual reference files for detailed explanations and code examples:
- Section definitions - Category structure and impact levels
- Rule template - Template for adding new rules
- Example: access-semantic-html
Full Compiled Document
For the complete guide with all rules expanded: AGENTS.md
FAQ
What does the ui-design skill do?
UI/UX and frontend design best practices guidelines (formerly frontend-design). This skill should be used when writing, reviewing, or designing frontend code to ensure accessibility, performance, and usability. Triggers on tasks involving HTML structure, CSS styling, responsive layouts, form design, animations, or accessibility improvements.
How do I install ui-design?
Run npx skills add https://github.com/pproenca/dot-skills --skill ui-design in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/ui-design/ (personal) or .claude/skills/ui-design/ (project).
Which AI agents can use ui-design?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is ui-design safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains ui-design?
It is published by pproenca in pproenca/dot-skills. It has 818 recorded installs.
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