36 CSS Search Bars
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All 36 in 36 CSS Search Bars

  1. 01Command Palette Cmd+K Search Bar
  2. 02Algolia-Style Instant Search with Highlighted Results Dropdown
  3. 03E-Commerce Product Search Bar with Category Scope Dropdown
  4. 04Header Navbar Integrated Sticky Search Bar
  5. 05SaaS Dashboard Command Search with Recent and Suggested
  6. 06Minimal CSS Search Bar with Animated Underline
  7. 07CSS Rounded Pill Search Bar with Submit Button
  8. 08Glassmorphism CSS Search Bar (Backdrop Blur)
  9. 09Neon Glow CSS Search Bar (Cyberpunk)
  10. 10CSS Search Bar with Animated Caret Highlight
  11. 11CSS Search Bar with Voice Input Microphone Button
  12. 12CSS Search Bar with Loading Spinner Indicator
  13. 13CSS Search Bar with Clear Button (X on Type)
  14. 14Animated Expanding CSS Search Bar on Focus
  15. 15CSS Search Bar with Autocomplete Suggestions Dropdown
  16. 16CSS Search Bar with Keyboard Shortcut Hint (Cmd K / Ctrl K)
  17. 17CSS Search Bar with Filter Chip Tags
  18. 18CSS Search Bar with Recent Searches Dropdown
  19. 19CSS Search Bar with Rotating Placeholder Text
  20. 20CSS People Search Bar with Avatar Chips
  21. 21Neo-Brutalist CSS Search Bar with Offset Stamp
  22. 22Compact Toolbar CSS Search Bar (Docs / Wiki)
  23. 23Hero Section CSS Search Bar with CTA
  24. 24CSS Search Bar with Side Category Indicator
  25. 25Floating CSS Search Bar with Drop Shadow (Elevated)
  26. 26CSS Search + Filter Sidebar Combo Bar
  27. 27CSS Search Bar with Inline Loading Progress Bar
  28. 28CSS Search Bar with Dual-Tone Border Outline
  29. 29CSS Glitch Search Bar with RGB Split Effect
  30. 30Mobile-First Compact CSS Search Bar
  31. 31CSS Search Bar with Focus Ring Bloom Animation
  32. 32CSS Search Bar Combo with Scope Selector
  33. 33CSS Search Bar with Inset Pressed 3D Effect
  34. 34CSS Search Bar with Animated Border Trace
  35. 35Floating Card CSS Search Bar (Modal Style)
  36. 36Aurora Gradient CSS Search Bar
Light JSMIT licensed

CSS Search Bar with Inline Loading Progress Bar

A hairline progress bar rides the field's bottom edge: an indeterminate sweep while the request is in flight, then a determinate fill to 100% and a fade-out. Two keyframes, one data-state, and a real role="progressbar" for assistive tech.

Live Demo
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The code

<div class="sb-27">
  <button class="sb-27__theme" type="button" aria-pressed="false" aria-label="Switch to dark theme">
    <svg class="sb-27__moon" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M20 14.2A8.2 8.2 0 0 1 9.8 4 8.4 8.4 0 1 0 20 14.2"/></svg>
    <svg class="sb-27__sun" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><circle cx="12" cy="12" r="4"/><path d="M12 3.4v2M12 18.6v2M3.4 12h2M18.6 12h2M6 6l1.4 1.4M16.6 16.6 18 18M18 6l-1.4 1.4M7.4 16.6 6 18"/></svg>
  </button>
  <div class="sb-27__stage">
    <div class="sb-27__bar" id="sb-27-bar" role="search" data-state="idle">
      <svg class="sb-27__ico" viewBox="0 0 24 24" fill="none" aria-hidden="true" focusable="false"><circle cx="11" cy="11" r="6.4" stroke="currentColor" stroke-width="1.8"/><path d="m16 16 4.2 4.2" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/></svg>
      <label class="sb-27__vh" for="sb-27-input">Search the catalogue</label>
      <input class="sb-27__input" id="sb-27-input" type="search" placeholder="Search 2.4M records&hellip;" autocomplete="off">
      <button class="sb-27__go" id="sb-27-go" type="button">Search</button>
      <span class="sb-27__track" id="sb-27-progress" role="progressbar" aria-label="Search progress">
        <span class="sb-27__fill"></span>
      </span>
    </div>
  </div>
</div>
.sb-27 {
  --bg: #f5f6f9;
  --card: #ffffff;
  --ink: #131720;
  --muted: #69707e;
  --line: #e3e6ed;
  --acc: #e11d48;
  --acc-2: #f43f5e;
  --wash: rgba(225,29,72,.10);
  --ring: #e11d48;
  --shadow: rgba(19,23,32,.14);
  width: 100%;
  min-height: 100vh;
  min-height: 100svh;
  display: block;
  box-sizing: border-box;
  font-family: system-ui,-apple-system,"Segoe UI",sans-serif;
  color: var(--ink);
  background: radial-gradient(40rem 22rem at 50% 8%, #fff, var(--bg) 74%);
  -webkit-font-smoothing: antialiased;
}

.sb-27 *,
.sb-27 *::before,
.sb-27 *::after {
  box-sizing: border-box;
}

.sb-27__stage {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: clamp(1rem,4vw,3rem);
}

.sb-27__vh {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.sb-27__bar {
  position: relative;
  display: flex;
  align-items: center;
  gap: .7rem;
  overflow: hidden;
  inline-size: min(32rem,100%);
  min-block-size: 56px;
  padding-inline: 1.05rem .45rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  box-shadow: 0 1px 2px rgba(19,23,32,.05);
  transition: border-color .2s, box-shadow .2s;
}

.sb-27__bar:focus-within {
  border-color: var(--acc);
  box-shadow: 0 0 0 4px var(--wash);
}

.sb-27__ico {
  inline-size: 19px;
  block-size: 19px;
  flex: none;
  color: var(--muted);
}

.sb-27__input {
  flex: 1;
  min-inline-size: 0;
  border: 0;
  background: none;
  color: var(--ink);
  font: 400 .96rem/1 inherit;
}

.sb-27__input::placeholder {
  color: var(--muted);
}

.sb-27__input:focus {
  outline: none;
}

.sb-27__input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
}

.sb-27__go {
  flex: none;
  min-block-size: 44px;
  padding-inline: 1.1rem;
  border: 0;
  border-radius: 10px;
  background: var(--acc);
  color: #fff;
  cursor: pointer;
  font: 600 .88rem/1 inherit;
  transition: filter .18s, scale .12s;
}

.sb-27__go:hover {
  filter: brightness(1.08);
}

.sb-27__go:active {
  scale: .97;
}

.sb-27__go:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 3px;
}

.sb-27__track {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  block-size: 2.5px;
  overflow: hidden;
  opacity: 0;
  transition: opacity .25s;
}

.sb-27__fill {
  display: block;
  inline-size: 100%;
  block-size: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--acc), var(--acc-2));
  -webkit-transform: scaleX(0);
  transform: scaleX(0);
  scale: 0 1;
  transform-origin: left center;
}

.sb-27__bar[data-state="loading"] .sb-27__track,
.sb-27__bar[data-state="done"] .sb-27__track {
  opacity: 1;
}

.sb-27__bar[data-state="loading"] .sb-27__fill {
  animation: sb-27-sweep 1.15s ease-in-out infinite;
}

@keyframes sb-27-sweep {
  0% {
    -webkit-transform: translateX(-100%) scaleX(.35);
    transform: translateX(-100%) scaleX(.35);
    translate: -100% 0;
    scale: .35 1;
  }

  50% {
    -webkit-transform: translateX(20%) scaleX(.6);
    transform: translateX(20%) scaleX(.6);
    translate: 20% 0;
    scale: .6 1;
  }

  100% {
    -webkit-transform: translateX(100%) scaleX(.35);
    transform: translateX(100%) scaleX(.35);
    translate: 100% 0;
    scale: .35 1;
  }
}

.sb-27__bar[data-state="done"] .sb-27__fill {
  animation: none;
  -webkit-transform: scaleX(1);
  transform: scaleX(1);
  translate: 0 0;
  scale: 1 1;
  transition: scale .3s cubic-bezier(.2,.9,.25,1), transform .3s cubic-bezier(.2,.9,.25,1);
}

.sb-27[data-theme="dark"] {
  --bg: #0b0e14;
  --card: #141922;
  --ink: #e9ecf4;
  --muted: #878f9e;
  --line: #232a37;
  --acc: #fb7185;
  --acc-2: #f472b6;
  --wash: rgba(251,113,133,.14);
  --ring: #fb7185;
  --shadow: rgba(0,0,0,.7);
  background: radial-gradient(40rem 22rem at 50% 8%, #171d29, var(--bg) 74%);
}

.sb-27[data-theme="dark"] .sb-27__go {
  color: #160b10;
}

@media (prefers-color-scheme: dark) {
  .sb-27:not([data-theme="light"]) {
    --bg: #0b0e14;
    --card: #141922;
    --ink: #e9ecf4;
    --muted: #878f9e;
    --line: #232a37;
    --acc: #fb7185;
    --acc-2: #f472b6;
    --wash: rgba(251,113,133,.14);
    --ring: #fb7185;
    --shadow: rgba(0,0,0,.7);
    background: radial-gradient(40rem 22rem at 50% 8%, #171d29, var(--bg) 74%);
  }

  .sb-27:not([data-theme="light"]) .sb-27__go {
    color: #160b10;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sb-27 *,
    .sb-27 *::before,
    .sb-27 *::after {
    transition: none !important;
  }

  .sb-27__bar[data-state="loading"] .sb-27__fill {
    animation: none;
    scale: .4 1;
  }
}

@media (forced-colors: active) {
  .sb-27__bar {
    border: 1px solid CanvasText;
  }

  .sb-27__fill {
    background: Highlight;
  }
}

.sb-27__theme {
  position: absolute;
  inset-block-start: clamp(.75rem,2vw,1.25rem);
  inset-inline-end: clamp(.75rem,2vw,1.25rem);
  z-index: 50;
  inline-size: 2.5rem;
  block-size: 2.5rem;
  display: grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(0,0,0,.12);
  color: currentColor;
  background: rgba(255,255,255,.72);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background .25s ease, transform .25s cubic-bezier(.16,1,.3,1), border-color .25s ease;
}

.sb-27[data-theme="dark"] .sb-27__theme {
  background: rgba(20,20,28,.72);
  border-color: rgba(255,255,255,.15);
  color: #fff;
}

@media (prefers-color-scheme: dark) {
  .sb-27:not([data-theme="light"]) .sb-27__theme {
    background: rgba(20,20,28,.72);
    border-color: rgba(255,255,255,.15);
    color: #fff;
  }
}

.sb-27__theme:hover {
  transform: translateY(-1px);
  border-color: rgba(0,0,0,.24);
}

.sb-27[data-theme="dark"] .sb-27__theme:hover,
.sb-27:not([data-theme="light"]) .sb-27__theme:hover {
  border-color: rgba(255,255,255,.3);
}

.sb-27__theme:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

.sb-27__theme svg {
  grid-area: 1/1;
  inline-size: 1.1rem;
  block-size: 1.1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sb-27__sun {
  display: none;
}

.sb-27__theme[aria-pressed="true"] .sb-27__sun {
  display: block;
}

.sb-27__theme[aria-pressed="true"] .sb-27__moon {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .sb-27__theme {
    transition: none;
  }

  .sb-27__theme:hover {
    transform: none;
  }
}
(() => {
  const root = document.querySelector('.sb-27');
  if (!root) return;
  const bar = root.querySelector('#sb-27-bar');
  const input = root.querySelector('#sb-27-input');
  const pb = root.querySelector('#sb-27-progress');
  let t1, t2;

  const run = () => {
    clearTimeout(t1); clearTimeout(t2);
    bar.dataset.state = 'loading';
    bar.setAttribute('aria-busy', 'true');
    pb.removeAttribute('aria-valuenow');                 /* indeterminate: omit the value */
    t1 = setTimeout(() => {
      bar.dataset.state = 'done';                        /* fill to 100% */
      pb.setAttribute('aria-valuenow', '100');
      pb.setAttribute('aria-valuetext', 'Search complete');
      bar.removeAttribute('aria-busy');
      t2 = setTimeout(() => { bar.dataset.state = 'idle'; }, 700);
    }, 1400);
  };

  root.querySelector('#sb-27-go').addEventListener('click', run);
  input.addEventListener('keydown', (e) => { if (e.key === 'Enter') { e.preventDefault(); run(); } });
})();
(()=>{const r=document.querySelector('.sb-27');if(!r)return;const t=r.querySelector('.sb-27__theme');if(!t)return;const dark=()=>(r.dataset.theme||(matchMedia('(prefers-color-scheme: dark)').matches?'dark':'light'))==='dark';const sync=()=>{t.setAttribute('aria-pressed',String(dark()));t.setAttribute('aria-label',dark()?'Switch to light theme':'Switch to dark theme');};t.addEventListener('click',()=>{r.dataset.theme=dark()?'light':'dark';sync();});matchMedia('(prefers-color-scheme: dark)').addEventListener('change',()=>{if(!r.dataset.theme)sync();});sync();})();
Paste this into ChatGPT, Claude, Cursor, or any coding assistant. The block below is pre-framed with everything the AI needs to integrate this demo into your project — markup, styles, scoping notes, and the source URL. Hit Copy and paste straight into your chat.
Here's a working CSS Search Bar from CodeFronts. Use it as-is or adapt to your framework. All classes are scoped under a unique prefix so the code won't collide with your existing styles. MIT licensed.
Demo: CSS Search Bar with Inline Loading Progress Bar
Source: https://codefronts.com/components/css-search-boxes/inline-loading-bar/

A hairline progress bar rides the field's bottom edge: an indeterminate sweep while the request is in flight, then a determinate fill to 100% and a fade-out. Two keyframes, one data-state, and a real role="progressbar" for assistive tech.
## HTML
```html
<div class="sb-27">
  <button class="sb-27__theme" type="button" aria-pressed="false" aria-label="Switch to dark theme">
    <svg class="sb-27__moon" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M20 14.2A8.2 8.2 0 0 1 9.8 4 8.4 8.4 0 1 0 20 14.2"/></svg>
    <svg class="sb-27__sun" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><circle cx="12" cy="12" r="4"/><path d="M12 3.4v2M12 18.6v2M3.4 12h2M18.6 12h2M6 6l1.4 1.4M16.6 16.6 18 18M18 6l-1.4 1.4M7.4 16.6 6 18"/></svg>
  </button>
  <div class="sb-27__stage">
    <div class="sb-27__bar" id="sb-27-bar" role="search" data-state="idle">
      <svg class="sb-27__ico" viewBox="0 0 24 24" fill="none" aria-hidden="true" focusable="false"><circle cx="11" cy="11" r="6.4" stroke="currentColor" stroke-width="1.8"/><path d="m16 16 4.2 4.2" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/></svg>
      <label class="sb-27__vh" for="sb-27-input">Search the catalogue</label>
      <input class="sb-27__input" id="sb-27-input" type="search" placeholder="Search 2.4M records&hellip;" autocomplete="off">
      <button class="sb-27__go" id="sb-27-go" type="button">Search</button>
      <span class="sb-27__track" id="sb-27-progress" role="progressbar" aria-label="Search progress">
        <span class="sb-27__fill"></span>
      </span>
    </div>
  </div>
</div>
```
## CSS
```css
.sb-27 {
  --bg: #f5f6f9;
  --card: #ffffff;
  --ink: #131720;
  --muted: #69707e;
  --line: #e3e6ed;
  --acc: #e11d48;
  --acc-2: #f43f5e;
  --wash: rgba(225,29,72,.10);
  --ring: #e11d48;
  --shadow: rgba(19,23,32,.14);
  width: 100%;
  min-height: 100vh;
  min-height: 100svh;
  display: block;
  box-sizing: border-box;
  font-family: system-ui,-apple-system,"Segoe UI",sans-serif;
  color: var(--ink);
  background: radial-gradient(40rem 22rem at 50% 8%, #fff, var(--bg) 74%);
  -webkit-font-smoothing: antialiased;
}

.sb-27 *,
.sb-27 *::before,
.sb-27 *::after {
  box-sizing: border-box;
}

.sb-27__stage {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: clamp(1rem,4vw,3rem);
}

.sb-27__vh {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.sb-27__bar {
  position: relative;
  display: flex;
  align-items: center;
  gap: .7rem;
  overflow: hidden;
  inline-size: min(32rem,100%);
  min-block-size: 56px;
  padding-inline: 1.05rem .45rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  box-shadow: 0 1px 2px rgba(19,23,32,.05);
  transition: border-color .2s, box-shadow .2s;
}

.sb-27__bar:focus-within {
  border-color: var(--acc);
  box-shadow: 0 0 0 4px var(--wash);
}

.sb-27__ico {
  inline-size: 19px;
  block-size: 19px;
  flex: none;
  color: var(--muted);
}

.sb-27__input {
  flex: 1;
  min-inline-size: 0;
  border: 0;
  background: none;
  color: var(--ink);
  font: 400 .96rem/1 inherit;
}

.sb-27__input::placeholder {
  color: var(--muted);
}

.sb-27__input:focus {
  outline: none;
}

.sb-27__input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
}

.sb-27__go {
  flex: none;
  min-block-size: 44px;
  padding-inline: 1.1rem;
  border: 0;
  border-radius: 10px;
  background: var(--acc);
  color: #fff;
  cursor: pointer;
  font: 600 .88rem/1 inherit;
  transition: filter .18s, scale .12s;
}

.sb-27__go:hover {
  filter: brightness(1.08);
}

.sb-27__go:active {
  scale: .97;
}

.sb-27__go:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 3px;
}

.sb-27__track {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  block-size: 2.5px;
  overflow: hidden;
  opacity: 0;
  transition: opacity .25s;
}

.sb-27__fill {
  display: block;
  inline-size: 100%;
  block-size: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--acc), var(--acc-2));
  -webkit-transform: scaleX(0);
  transform: scaleX(0);
  scale: 0 1;
  transform-origin: left center;
}

.sb-27__bar[data-state="loading"] .sb-27__track,
.sb-27__bar[data-state="done"] .sb-27__track {
  opacity: 1;
}

.sb-27__bar[data-state="loading"] .sb-27__fill {
  animation: sb-27-sweep 1.15s ease-in-out infinite;
}

@keyframes sb-27-sweep {
  0% {
    -webkit-transform: translateX(-100%) scaleX(.35);
    transform: translateX(-100%) scaleX(.35);
    translate: -100% 0;
    scale: .35 1;
  }

  50% {
    -webkit-transform: translateX(20%) scaleX(.6);
    transform: translateX(20%) scaleX(.6);
    translate: 20% 0;
    scale: .6 1;
  }

  100% {
    -webkit-transform: translateX(100%) scaleX(.35);
    transform: translateX(100%) scaleX(.35);
    translate: 100% 0;
    scale: .35 1;
  }
}

.sb-27__bar[data-state="done"] .sb-27__fill {
  animation: none;
  -webkit-transform: scaleX(1);
  transform: scaleX(1);
  translate: 0 0;
  scale: 1 1;
  transition: scale .3s cubic-bezier(.2,.9,.25,1), transform .3s cubic-bezier(.2,.9,.25,1);
}

.sb-27[data-theme="dark"] {
  --bg: #0b0e14;
  --card: #141922;
  --ink: #e9ecf4;
  --muted: #878f9e;
  --line: #232a37;
  --acc: #fb7185;
  --acc-2: #f472b6;
  --wash: rgba(251,113,133,.14);
  --ring: #fb7185;
  --shadow: rgba(0,0,0,.7);
  background: radial-gradient(40rem 22rem at 50% 8%, #171d29, var(--bg) 74%);
}

.sb-27[data-theme="dark"] .sb-27__go {
  color: #160b10;
}

@media (prefers-color-scheme: dark) {
  .sb-27:not([data-theme="light"]) {
    --bg: #0b0e14;
    --card: #141922;
    --ink: #e9ecf4;
    --muted: #878f9e;
    --line: #232a37;
    --acc: #fb7185;
    --acc-2: #f472b6;
    --wash: rgba(251,113,133,.14);
    --ring: #fb7185;
    --shadow: rgba(0,0,0,.7);
    background: radial-gradient(40rem 22rem at 50% 8%, #171d29, var(--bg) 74%);
  }

  .sb-27:not([data-theme="light"]) .sb-27__go {
    color: #160b10;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sb-27 *,
    .sb-27 *::before,
    .sb-27 *::after {
    transition: none !important;
  }

  .sb-27__bar[data-state="loading"] .sb-27__fill {
    animation: none;
    scale: .4 1;
  }
}

@media (forced-colors: active) {
  .sb-27__bar {
    border: 1px solid CanvasText;
  }

  .sb-27__fill {
    background: Highlight;
  }
}

.sb-27__theme {
  position: absolute;
  inset-block-start: clamp(.75rem,2vw,1.25rem);
  inset-inline-end: clamp(.75rem,2vw,1.25rem);
  z-index: 50;
  inline-size: 2.5rem;
  block-size: 2.5rem;
  display: grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(0,0,0,.12);
  color: currentColor;
  background: rgba(255,255,255,.72);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background .25s ease, transform .25s cubic-bezier(.16,1,.3,1), border-color .25s ease;
}

.sb-27[data-theme="dark"] .sb-27__theme {
  background: rgba(20,20,28,.72);
  border-color: rgba(255,255,255,.15);
  color: #fff;
}

@media (prefers-color-scheme: dark) {
  .sb-27:not([data-theme="light"]) .sb-27__theme {
    background: rgba(20,20,28,.72);
    border-color: rgba(255,255,255,.15);
    color: #fff;
  }
}

.sb-27__theme:hover {
  transform: translateY(-1px);
  border-color: rgba(0,0,0,.24);
}

.sb-27[data-theme="dark"] .sb-27__theme:hover,
.sb-27:not([data-theme="light"]) .sb-27__theme:hover {
  border-color: rgba(255,255,255,.3);
}

.sb-27__theme:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

.sb-27__theme svg {
  grid-area: 1/1;
  inline-size: 1.1rem;
  block-size: 1.1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sb-27__sun {
  display: none;
}

.sb-27__theme[aria-pressed="true"] .sb-27__sun {
  display: block;
}

.sb-27__theme[aria-pressed="true"] .sb-27__moon {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .sb-27__theme {
    transition: none;
  }

  .sb-27__theme:hover {
    transform: none;
  }
}
```

## JavaScript
```js
(() => {
  const root = document.querySelector('.sb-27');
  if (!root) return;
  const bar = root.querySelector('#sb-27-bar');
  const input = root.querySelector('#sb-27-input');
  const pb = root.querySelector('#sb-27-progress');
  let t1, t2;

  const run = () => {
    clearTimeout(t1); clearTimeout(t2);
    bar.dataset.state = 'loading';
    bar.setAttribute('aria-busy', 'true');
    pb.removeAttribute('aria-valuenow');                 /* indeterminate: omit the value */
    t1 = setTimeout(() => {
      bar.dataset.state = 'done';                        /* fill to 100% */
      pb.setAttribute('aria-valuenow', '100');
      pb.setAttribute('aria-valuetext', 'Search complete');
      bar.removeAttribute('aria-busy');
      t2 = setTimeout(() => { bar.dataset.state = 'idle'; }, 700);
    }, 1400);
  };

  root.querySelector('#sb-27-go').addEventListener('click', run);
  input.addEventListener('keydown', (e) => { if (e.key === 'Enter') { e.preventDefault(); run(); } });
})();
(()=>{const r=document.querySelector('.sb-27');if(!r)return;const t=r.querySelector('.sb-27__theme');if(!t)return;const dark=()=>(r.dataset.theme||(matchMedia('(prefers-color-scheme: dark)').matches?'dark':'light'))==='dark';const sync=()=>{t.setAttribute('aria-pressed',String(dark()));t.setAttribute('aria-label',dark()?'Switch to light theme':'Switch to dark theme');};t.addEventListener('click',()=>{r.dataset.theme=dark()?'light':'dark';sync();});matchMedia('(prefers-color-scheme: dark)').addEventListener('change',()=>{if(!r.dataset.theme)sync();});sync();})();
```

How this works

Indeterminate, cheaply. The bar is a full-width element scaled down and slid across. Both properties are compositor-only, so the animation costs nothing even on a phone:

@keyframes sb-27-sweep{
  0%  {translate:-100% 0; scale:.35 1;}
  50% {translate:20% 0;   scale:.6 1;}
  100%{translate:100% 0;  scale:.35 1;}
}
.sb-27__bar[data-state="loading"] .sb-27__fill{animation:sb-27-sweep 1.15s ease-in-out infinite;}

Then switch to determinate. Once the response starts arriving, stop the animation and drive a scale from a property:

.sb-27__bar[data-state="done"] .sb-27__fill{
  animation:none; scale:var(--p,1) 1; transform-origin:left; transition:scale .3s;
}

Expose it properly. An indeterminate progressbar omits aria-valuenow entirely (that is how AT knows it is unknown); a determinate one sets aria-valuenow and a human-readable aria-valuetext. The demo also flips aria-busy on the field.

Make it yours

  • Change the sweep duration to match perceived latency: 1.1-1.4s reads as "working", under 0.8s reads as "stuck in a loop".
  • Thicken to 3px for a page-level bar; 2px is right inside a control.
  • Colour the bar with a two-stop gradient for a YouTube-style look — it still animates on the compositor.
  • Hook real progress by writing --p from an XMLHttpRequest progress event or a streamed fetch reader.

Gotchas — read before shipping

  • Do not animate width or inline-size for progress; it forces layout on every frame and is the classic cause of janky loading bars.
  • An indeterminate bar with aria-valuenow="0" is announced as "0 percent" forever — omit the attribute instead.
  • Always finish the bar. A loading indicator that disappears without reaching 100% reads as a failure even on success.
  • Keep the bar inside the field's border radius with overflow:hidden on the wrapper, or its square ends poke out of the rounded corners.

Browser support

ChromeSafariFirefoxEdge
104+14.1+72+104+

Individual scale/translate properties are Chrome 104 / Safari 14.1 / Firefox 72, with transform fallbacks declared first. role=progressbar and aria-valuetext are universally supported by current screen readers.

Techniques used in this demo

:focus-withinMDN ↗filterMDN ↗backdrop-filterMDN ↗clip-pathMDN ↗role="" (ARIA)MDN ↗radial-gradient()MDN ↗

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