Works with the AI tools you already use
morphcss
by Agundur
Ship high-performance, accessible UI interactions and animations using CSS-first patterns with minimal JavaScript.
Secure checkout via Stripe
See it in action
You say
Create a scroll-linked progress bar for a long article that shows the reading progress at the top of the page. Use no JS.
Your agent does
@supports (animation-timeline: scroll()) { .progress-bar { position: fixed; top: 0; width: 100%; height: 5px; background: var(--primary); transform-origin: 0 50%; animation: scale-progress auto linear; animation-timeline: scroll(root); } }
@keyframes scale-progress { from { transform: scaleX(0); } to { transform: scaleX(1); } }
What you get
About this skill
The problem
Modern web interactions often force heavy JavaScript bundles for simple UI patterns like modals or accordions. This bloats your site, increases TTI, and creates accessibility gaps when JS fails to load.
What it does
- Implements high-performance motion and interaction patterns using CSS-first techniques like @starting-style and scroll-driven animations.
- Reduces JavaScript reliance by utilizing native browser features like :user-invalid for form validation and <details> for accordions.
- Enforces accessibility standards including prefers-reduced-motion and keyboard-reachable focus states.
- Provides cross-browser compatibility data by checking global support percentages and specific browser gaps for new CSS specs.
Frameworks & tools
Vanilla CSS, HTML5, and minimal JavaScript. Includes specific integration logic for SASS and Bootstrap environments within BonsaiPress projects.
Why this beats prompting it yourself
Standard LLMs often suggest outdated jQuery or heavy JS libraries for UI components. This skill forces a "CSS-first" approach, providing production-ready code that respects font-metric leading and complex scroll-state behaviors that generic prompts miss.
Use cases
- Build lightweight carousels and accordions without a JS framework.
- Create scroll-driven reveal animations and progress indicators.
- Implement dark mode toggles with localStorage persistence.
- Design forms with live validation feedback using native CSS pseudo-classes.
Known limitations
Relies on modern CSS features; some patterns like Anchor Positioning or @function have limited support in Safari/Firefox. Headless browser testing cannot currently verify open-picker states or programmatic scroll-state triggers.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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