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Added 30 Aug 2026
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buffer-bar-15619
Buffer Bar
Progress & Meters

Buffer Bar

Media scrubber showing three states in one track — played, buffered ahead and not yet loaded — with a knob that swells on hover.

Progress & Metersbufferscrubbermediaplaybackthree-state
lines of CSS
64lines of CSS
dependencies
0dependencies
browser, for years
Everybrowser, for years
stops under reduced motion
Guardedstops under reduced motion
Backdrop
1:424:08
Open a live copy in

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

buffer-bar-15619.css
.fx-v13-pr-buffer-15618 {
  width: 242px;
}
.fx-v13-pr-buffer-15618 .tr {
  position: relative;
  height: 6px;
  border-radius: 3px;
  background: rgba(148,163,184,0.18);
  cursor: pointer;
}
.fx-v13-pr-buffer-15618 .bu {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 74%;
  border-radius: 3px;
  background: rgba(203,213,225,0.32);
  animation: fx-v13-pr-buffer-15618-buffer 3.5s ease-in-out infinite;
}
.fx-v13-pr-buffer-15618 .pl {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 42%;
  border-radius: 3px;
  background: #f43f5e;
}
.fx-v13-pr-buffer-15618 .kn {
  position: absolute;
  left: 42%;
  top: 50%;
  width: 12px;
  height: 12px;
  margin: -6px 0 0 -6px;
  border-radius: 50%;
  background: #f43f5e;
  box-shadow: 0 0 0 0 rgba(244,63,94,0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.fx-v13-pr-buffer-15618 .tr:hover .kn { transform: scale(1.25); box-shadow: 0 0 0 6px rgba(244,63,94,0.2); }
.fx-v13-pr-buffer-15618 .ti { display: flex; justify-content: space-between; margin-top: 0.45rem; font-size: 0.66rem; font-variant-numeric: tabular-nums; }
.fx-v13-pr-buffer-15618 b { color: #e2e8f0; }
.fx-v13-pr-buffer-15618 em { font-style: normal; color: #64748b; }
@keyframes fx-v13-pr-buffer-15618-buffer {
  0%, 100% { width: 68%; }
  50%      { width: 86%; }
}

@media (prefers-reduced-motion: reduce) {
  .fx-v13-pr-buffer-15618,
  .fx-v13-pr-buffer-15618::before,
  .fx-v13-pr-buffer-15618::after,
  .fx-v13-pr-buffer-15618 *,
  .fx-v13-pr-buffer-15618 *::before,
  .fx-v13-pr-buffer-15618 *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    animation-delay: 0ms !important;
    transition-duration: 1ms !important;
    transition-delay: 0ms !important;
  }
}
buffer-bar-15619.html
<div class="fx-v13-pr-buffer-15618">
  <div class="tr">
    <i class="bu"></i>
    <i class="pl"></i>
    <span class="kn"></span>
  </div>
  <div class="ti">
    <b>1:42</b>
    <em>4:08</em>
  </div>
</div>

What do I do with this?

  1. Put buffer-bar-15619.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-v13-pr-buffer-15618">. 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 buffer-bar-15619

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 buffer-bar-15619

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
Guarded

Ships a prefers-reduced-motion block, so the loop settles into its end state for visitors who ask for less motion.

What it animates
Reflows

Animates width (and 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 width 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

29 more effects in Progress & Meters

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 Progress & Meters

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 Buffer Bar

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