Show HN: Data-anim – Animate HTML with just data attributes

Hey HN, I built data-anim — an animation library where you never have to write JavaScript yourself. You just write: <div data-anim="fadeInUp">Hello</div> That's it. Scroll-triggered fade-in animation, zero JS to write. What it does: - 30+ built-in animations (fade, slide, zoom, bounce, rotate, etc.) - 4 triggers: scroll (default), load, click, hover - 3-layer anti-FOUC protection (immediate style injection → noscript fallback → 5s timeout) - Responsive controls: disable per device or swap animations on mobile - TypeScript autocomplete for all attributes - Under 3KB gzipped, zero dependencies Why I built this: I noticed that most animation needs on landing pages and marketing sites are simple — fade in on scroll, slide in from left, bounce on hover. But the existing options are either too heavy (Framer Motion ~30KB) or require JS boilerplate. I also think declarative HTML attributes are the most AI-friendly animation format. When LLMs generate UI, HTML attributes are the output they hallucinate least on — no selector matching, no JS API to misremember, no script execution order to get wrong. Docs: https://ryo-manba.github.io/data-anim/ Playground: https://ryo-manba.github.io/data-anim/playground/ npm: https://www.npmjs.com/package/data-anim Happy to answer any questions about the implementation or design decisions.