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Added 17 Aug 2026
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growing-textarea-field-15041
Growing Textarea Field
Inputs & Hover

Growing Textarea Field

Compact textarea that expands on focus while a teal character-count chip fades in at the corner.

Inputs & Hovertextareagrowcounterfocus
lines of CSS
41lines of CSS
dependencies
0dependencies
browser, for years
Everybrowser, for years
motion only on interaction
Hovermotion only on interaction
Backdrop
0 / 280
Open a live copy in

Vue, Svelte, styled-components and Tailwind exports are part of Pro. HTML, CSS and React are free forever.

growing-textarea-field-15041.css
.fx-v12-in-textarea-15040 {
  position: relative;
  width: 240px;
}
.fx-v12-in-textarea-15040 textarea {
  display: block;
  width: 100%;
  box-sizing: border-box;
  height: 68px;
  padding: 0.6rem 0.75rem 1.4rem;
  font: inherit;
  font-size: 0.9rem;
  line-height: 1.4;
  color: #e2e8f0;
  background: #0f172a;
  border: 1px solid #334155;
  border-radius: 0.6rem;
  outline: none;
  resize: none;
  transition: height 0.3s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.fx-v12-in-textarea-15040 textarea::placeholder { color: #475569; }
.fx-v12-in-textarea-15040 .count {
  position: absolute;
  right: 0.6rem;
  bottom: 0.5rem;
  padding: 0.1rem 0.45rem;
  font-size: 0.65rem;
  font-family: ui-monospace, monospace;
  color: #5eead4;
  background: rgba(20,184,166,0.15);
  border: 1px solid rgba(20,184,166,0.35);
  border-radius: 999px;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
}
.fx-v12-in-textarea-15040:hover textarea { border-color: #475569; }
.fx-v12-in-textarea-15040:focus-within textarea { height: 96px; border-color: #14b8a6; box-shadow: 0 0 0 3px rgba(20,184,166,0.22); }
.fx-v12-in-textarea-15040:focus-within .count { opacity: 1; transform: translateY(0); }
growing-textarea-field-15041.html
<div class="fx-v12-in-textarea-15040">
  <textarea rows="2" placeholder="Leave a note…"></textarea>
  <span class="count">0 / 280</span>
</div>

What do I do with this?

  1. Put growing-textarea-field-15041.css anywhere your page already loads CSS from — in Next.js that is app/globals.css, or any stylesheet with a <link> in your HTML.
  2. Then put the class on the element you want it on: <button class="fx-v12-in-textarea-15040">. The CSS does nothing until a class name in it matches something on the page.
  • Link the stylesheet, then paste the markup wherever you need it.
npx hoverlab add growing-textarea-field-15041

What's included

  • The markup and the stylesheet, in whichever framework you pick
  • No runtime dependencies

Works with

  • React
  • Vue
  • Svelte
  • Tailwind
  • styled-components
  • Plain CSS

npx hoverlab add growing-textarea-field-15041

Or over MCP, from your editor's agent — no account needed.

License

Free to read, copy and install, for personal and non-commercial projects. Shipping it in client work or a paid product needs Pro ($79 once). The source lands in your repo and stops being ours — no attribution, nothing to upgrade.

Was this useful?

Motion safety

Static estimate, read from the CSS

Reduced motion
Brief motion, no guard

Animates briefly or on interaction. Only looping motion gets a guard in this catalog; copy the one from the Insights tab if this ships on a critical path.

What it animates
Reflows

Animates height (and border-color, box-shadow). The browser re-lays-out the page on every frame; prefer transform if you can.

Flashing (WCAG 2.3.1)
No flashing found

No repeating change in opacity, colour or brightness large enough to count as a flash.

Layout shift (CLS)
May shift layout

Animates height on a box in flow, so content beside or after it can move. A category from the CSS, not a measurement for this effect.

Every row is read from the shipped CSS. Only a figure marked measured came from a browser. Customizing the speed changes the timing, so recheck a customized copy. How it is computed

38 more effects in Inputs & Hover

All of them free to read, copy and install — no account, no locked tiles, no watermarked preview. The whole catalog is open, and so are the API and the CLI.

Browse Inputs & Hover

Shipping one commercially

Copying the code is free. Putting it in client work or a paid product is what Pro is for — the licence, not the access.

  • A commercial licence for everything in the catalog
  • Unlimited bundle exports, in Vue, Svelte and Tailwind
  • One payment — no subscription, nothing to renew
Pro — $79 once

7 variations of Growing Textarea Field

Finished looks, each one a position in the customizer above. Copy any of them, or open it and keep moving the sliders.