Scroll Fill Text

A line that fills in as it is read, character by character.

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Category
Marketing
Access
Pro
Source
295 lines · one file
Added
23 Sept 2026

The decision inside it

Reduced motion fills it and stops

Tying colour to scroll position is motion whether or not anything moves on its own. When the system asks for less of it, the text renders filled and the listener is never attached.

When to use it

Use Scroll Fill Text for a statement that fills in word by word as the reader scrolls, with chosen words highlighted. It is a scroll effect, so it needs room to scroll past.

Installation

How you get it

Paste this into Claude Code, Cursor, Codex or any coding agent. It installs the file and uses it as it is, instead of writing a new one.

Use Liro's Scroll Fill Text for this.
Install it: npx shadcn@latest add @liro/scroll-fill-text
(the @liro registry is set up in components.json, with LIRO_KEY in .env.local)
Import it from @/components/ui/scroll-fill-text.
Do not rewrite or restyle it. Pass my data through its props
and keep its built-in states.

For the full brief with every prop and the mistakes assistants usually make, use Copy prompt above. Pro components install through the @liro registry with your CLI token: see the Namespaced tab.

Usage

components/manifesto.tsx
import { ScrollFillText } from "@/components/ui/scroll-fill-text";

export function Manifesto() {
  return (
    <ScrollFillText as="p" highlight={["finished", "accessible"]} className="text-3xl">
      Every screen your product needs, finished and accessible, ready to install.
    </ScrollFillText>
  );
}

API reference

“Copy prompt” above puts a full brief on your clipboard, install command, dependencies, props, and the mistakes an assistant usually makes with this component.

Dependencies

npm packages

clsxtailwind-merge

Liro foundations, installed alongside it

liro-theme

Accessibility

  • Keyboard reachable throughout, in visual order
  • Focus trapped in overlays, Escape closes them
  • Focus returns to whatever opened it
  • Live regions announce what changed, not that something did
  • Honours prefers-reduced-motion

Responsive behavior

  • Sizes to its container, not the viewport
  • Usable from 320px up
  • Pointer-based interaction, so trackpad and touch both work
  • No hover-only affordances