36 CSS Search Bars14 / 36

Pure CSSMIT licensed

Animated Expanding CSS Search Bar on Focus

A 44px circle that unfurls into a full search field when focused and folds back when you leave — the toolbar pattern from Gmail, Figma and every dense app header. Pure CSS: :focus-within drives an eased inline-size transition, and the input keeps its accessible name the whole time.

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The code

<div class="sb-14">
  <button class="sb-14__theme" type="button" aria-pressed="false" aria-label="Switch to dark theme">
    <svg class="sb-14__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-14__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-14__stage">
    <div class="sb-14__toolbar">
      <span class="sb-14__title">Projects</span>
      <div class="sb-14__spacer"></div>
      <div class="sb-14__box" role="search">
        <label class="sb-14__trigger" for="sb-14-input">
          <svg 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>
          <span class="sb-14__vh">Search projects</span>
        </label>
        <input class="sb-14__input" id="sb-14-input" type="search" placeholder="Search projects&hellip;" autocomplete="off">
      </div>
      <button class="sb-14__btn" type="button" aria-label="Filter">
        <svg viewBox="0 0 24 24" fill="none" aria-hidden="true" focusable="false"><path d="M4 6.5h16M7 12h10M10 17.5h4" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/></svg>
      </button>
      <button class="sb-14__btn sb-14__btn--solid" type="button">New project</button>
    </div>
  </div>
</div>
.sb-14 {
  --bg: #f3f4f7;
  --card: #ffffff;
  --ink: #12141a;
  --muted: #6d7280;
  --line: #e5e7ec;
  --acc: #12141a;
  --wash: #f0f1f5;
  --ring: #3d5afe;
  --shadow: rgba(18,20,26,.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(44rem 24rem at 50% 0%, #fff, var(--bg) 74%);
  -webkit-font-smoothing: antialiased;
}

.sb-14 *,
.sb-14 *::before,
.sb-14 *::after {
  box-sizing: border-box;
}

.sb-14__stage {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: clamp(1rem,4vw,3rem);
}

.sb-14__vh {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.sb-14__toolbar {
  display: flex;
  align-items: center;
  gap: .5rem;
  inline-size: min(46rem,100%);
  padding: .6rem .7rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  box-shadow: 0 18px 40px -30px var(--shadow), 0 1px 2px rgba(18,20,26,.04);
}

.sb-14__title {
  padding-inline: .45rem;
  font: 700 1rem/1 inherit;
  letter-spacing: -.01em;
}

.sb-14__spacer {
  flex: 1;
}

.sb-14__box {
  display: flex;
  align-items: center;
  flex: none;
  overflow: hidden;
  inline-size: 44px;
  block-size: 44px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: var(--wash);
  transition: inline-size .34s cubic-bezier(.2,.9,.25,1), background .2s, border-color .2s, box-shadow .2s;
}

.sb-14__box:hover {
  background: #e9ebf1;
}

.sb-14__box:focus-within {
  inline-size: min(22rem,60vw);
  background: var(--card);
  border-color: var(--acc);
  box-shadow: 0 0 0 3px rgba(18,20,26,.08);
}

.sb-14__box:has(.sb-14__input:not(:placeholder-shown)) {
  inline-size: min(22rem,60vw);
  background: var(--card);
  border-color: var(--line);
}

.sb-14__trigger {
  display: grid;
  place-items: center;
  inline-size: 44px;
  block-size: 44px;
  flex: none;
  cursor: pointer;
  color: var(--muted);
  transition: color .2s;
}

.sb-14__box:focus-within .sb-14__trigger {
  color: var(--acc);
}

.sb-14__trigger svg {
  inline-size: 19px;
  block-size: 19px;
}

.sb-14__input {
  flex: 1;
  min-inline-size: 0;
  border: 0;
  background: none;
  color: var(--ink);
  padding-inline-end: .9rem;
  font: 400 .93rem/1 inherit;
  opacity: 0;
  translate: -6px 0;
  transition: opacity .18s, translate .22s;
}

.sb-14__box:focus-within .sb-14__input,
.sb-14__box:has(.sb-14__input:not(:placeholder-shown)) .sb-14__input {
  opacity: 1;
  translate: 0 0;
  transition-delay: .12s;
}

.sb-14__input::placeholder {
  color: var(--muted);
}

.sb-14__input:focus {
  outline: none;
}

.sb-14__input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
}

.sb-14__btn {
  display: grid;
  place-items: center;
  min-inline-size: 44px;
  block-size: 44px;
  flex: none;
  padding-inline: .5rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
  font: 600 .87rem/1 inherit;
  transition: background .18s, translate .18s;
}

.sb-14__btn:hover {
  background: var(--wash);
}

.sb-14__btn--solid {
  padding-inline: 1rem;
  border-color: transparent;
  background: var(--acc);
  color: var(--card);
}

.sb-14__btn--solid:hover {
  filter: brightness(1.3);
  background: var(--acc);
}

.sb-14__btn svg {
  inline-size: 18px;
  block-size: 18px;
}

.sb-14 :focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

.sb-14__input:focus-visible {
  outline: none;
}

@media (max-width: 34rem) {
  .sb-14__btn--solid {
    display: none;
  }
}

.sb-14[data-theme="dark"] {
  --bg: #0c0e14;
  --card: #141821;
  --ink: #eceff6;
  --muted: #8b92a2;
  --line: #222836;
  --acc: #eceff6;
  --wash: #1c222e;
  --ring: #7d95ff;
  --shadow: rgba(0,0,0,.7);
  background: radial-gradient(44rem 24rem at 50% 0%, #171c28, var(--bg) 74%);
}

.sb-14[data-theme="dark"] .sb-14__box:hover {
  background: #232a38;
}

@media (prefers-color-scheme: dark) {
  .sb-14:not([data-theme="light"]) {
    --bg: #0c0e14;
    --card: #141821;
    --ink: #eceff6;
    --muted: #8b92a2;
    --line: #222836;
    --acc: #eceff6;
    --wash: #1c222e;
    --ring: #7d95ff;
    --shadow: rgba(0,0,0,.7);
    background: radial-gradient(44rem 24rem at 50% 0%, #171c28, var(--bg) 74%);
  }

  .sb-14:not([data-theme="light"]) .sb-14__box:hover {
    background: #232a38;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sb-14 *,
    .sb-14 *::before,
    .sb-14 *::after {
    transition: none !important;
    animation: none !important;
  }
}

@media (forced-colors: active) {
  .sb-14__toolbar,
    .sb-14__box,
    .sb-14__btn {
    border: 1px solid CanvasText;
  }
}

.sb-14__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-14[data-theme="dark"] .sb-14__theme {
  background: rgba(20,20,28,.72);
  border-color: rgba(255,255,255,.15);
  color: #fff;
}

@media (prefers-color-scheme: dark) {
  .sb-14:not([data-theme="light"]) .sb-14__theme {
    background: rgba(20,20,28,.72);
    border-color: rgba(255,255,255,.15);
    color: #fff;
  }
}

.sb-14__theme:hover {
  transform: translateY(-1px);
  border-color: rgba(0,0,0,.24);
}

.sb-14[data-theme="dark"] .sb-14__theme:hover,
.sb-14:not([data-theme="light"]) .sb-14__theme:hover {
  border-color: rgba(255,255,255,.3);
}

.sb-14__theme:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

.sb-14__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-14__sun {
  display: none;
}

.sb-14__theme[aria-pressed="true"] .sb-14__sun {
  display: block;
}

.sb-14__theme[aria-pressed="true"] .sb-14__moon {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .sb-14__theme {
    transition: none;
  }

  .sb-14__theme:hover {
    transform: none;
  }
}
(()=>{const r=document.querySelector('.sb-14');if(!r)return;const t=r.querySelector('.sb-14__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: Animated Expanding CSS Search Bar on Focus
Source: https://codefronts.com/components/css-search-boxes/expanding-input/

A 44px circle that unfurls into a full search field when focused and folds back when you leave — the toolbar pattern from Gmail, Figma and every dense app header. Pure CSS: :focus-within drives an eased inline-size transition, and the input keeps its accessible name the whole time.
## HTML
```html
<div class="sb-14">
  <button class="sb-14__theme" type="button" aria-pressed="false" aria-label="Switch to dark theme">
    <svg class="sb-14__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-14__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-14__stage">
    <div class="sb-14__toolbar">
      <span class="sb-14__title">Projects</span>
      <div class="sb-14__spacer"></div>
      <div class="sb-14__box" role="search">
        <label class="sb-14__trigger" for="sb-14-input">
          <svg 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>
          <span class="sb-14__vh">Search projects</span>
        </label>
        <input class="sb-14__input" id="sb-14-input" type="search" placeholder="Search projects&hellip;" autocomplete="off">
      </div>
      <button class="sb-14__btn" type="button" aria-label="Filter">
        <svg viewBox="0 0 24 24" fill="none" aria-hidden="true" focusable="false"><path d="M4 6.5h16M7 12h10M10 17.5h4" stroke="currentColor" stroke-width="1.8" stroke-linecap="round"/></svg>
      </button>
      <button class="sb-14__btn sb-14__btn--solid" type="button">New project</button>
    </div>
  </div>
</div>
```
## CSS
```css
.sb-14 {
  --bg: #f3f4f7;
  --card: #ffffff;
  --ink: #12141a;
  --muted: #6d7280;
  --line: #e5e7ec;
  --acc: #12141a;
  --wash: #f0f1f5;
  --ring: #3d5afe;
  --shadow: rgba(18,20,26,.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(44rem 24rem at 50% 0%, #fff, var(--bg) 74%);
  -webkit-font-smoothing: antialiased;
}

.sb-14 *,
.sb-14 *::before,
.sb-14 *::after {
  box-sizing: border-box;
}

.sb-14__stage {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: clamp(1rem,4vw,3rem);
}

.sb-14__vh {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.sb-14__toolbar {
  display: flex;
  align-items: center;
  gap: .5rem;
  inline-size: min(46rem,100%);
  padding: .6rem .7rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card);
  box-shadow: 0 18px 40px -30px var(--shadow), 0 1px 2px rgba(18,20,26,.04);
}

.sb-14__title {
  padding-inline: .45rem;
  font: 700 1rem/1 inherit;
  letter-spacing: -.01em;
}

.sb-14__spacer {
  flex: 1;
}

.sb-14__box {
  display: flex;
  align-items: center;
  flex: none;
  overflow: hidden;
  inline-size: 44px;
  block-size: 44px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: var(--wash);
  transition: inline-size .34s cubic-bezier(.2,.9,.25,1), background .2s, border-color .2s, box-shadow .2s;
}

.sb-14__box:hover {
  background: #e9ebf1;
}

.sb-14__box:focus-within {
  inline-size: min(22rem,60vw);
  background: var(--card);
  border-color: var(--acc);
  box-shadow: 0 0 0 3px rgba(18,20,26,.08);
}

.sb-14__box:has(.sb-14__input:not(:placeholder-shown)) {
  inline-size: min(22rem,60vw);
  background: var(--card);
  border-color: var(--line);
}

.sb-14__trigger {
  display: grid;
  place-items: center;
  inline-size: 44px;
  block-size: 44px;
  flex: none;
  cursor: pointer;
  color: var(--muted);
  transition: color .2s;
}

.sb-14__box:focus-within .sb-14__trigger {
  color: var(--acc);
}

.sb-14__trigger svg {
  inline-size: 19px;
  block-size: 19px;
}

.sb-14__input {
  flex: 1;
  min-inline-size: 0;
  border: 0;
  background: none;
  color: var(--ink);
  padding-inline-end: .9rem;
  font: 400 .93rem/1 inherit;
  opacity: 0;
  translate: -6px 0;
  transition: opacity .18s, translate .22s;
}

.sb-14__box:focus-within .sb-14__input,
.sb-14__box:has(.sb-14__input:not(:placeholder-shown)) .sb-14__input {
  opacity: 1;
  translate: 0 0;
  transition-delay: .12s;
}

.sb-14__input::placeholder {
  color: var(--muted);
}

.sb-14__input:focus {
  outline: none;
}

.sb-14__input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
}

.sb-14__btn {
  display: grid;
  place-items: center;
  min-inline-size: 44px;
  block-size: 44px;
  flex: none;
  padding-inline: .5rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
  font: 600 .87rem/1 inherit;
  transition: background .18s, translate .18s;
}

.sb-14__btn:hover {
  background: var(--wash);
}

.sb-14__btn--solid {
  padding-inline: 1rem;
  border-color: transparent;
  background: var(--acc);
  color: var(--card);
}

.sb-14__btn--solid:hover {
  filter: brightness(1.3);
  background: var(--acc);
}

.sb-14__btn svg {
  inline-size: 18px;
  block-size: 18px;
}

.sb-14 :focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
}

.sb-14__input:focus-visible {
  outline: none;
}

@media (max-width: 34rem) {
  .sb-14__btn--solid {
    display: none;
  }
}

.sb-14[data-theme="dark"] {
  --bg: #0c0e14;
  --card: #141821;
  --ink: #eceff6;
  --muted: #8b92a2;
  --line: #222836;
  --acc: #eceff6;
  --wash: #1c222e;
  --ring: #7d95ff;
  --shadow: rgba(0,0,0,.7);
  background: radial-gradient(44rem 24rem at 50% 0%, #171c28, var(--bg) 74%);
}

.sb-14[data-theme="dark"] .sb-14__box:hover {
  background: #232a38;
}

@media (prefers-color-scheme: dark) {
  .sb-14:not([data-theme="light"]) {
    --bg: #0c0e14;
    --card: #141821;
    --ink: #eceff6;
    --muted: #8b92a2;
    --line: #222836;
    --acc: #eceff6;
    --wash: #1c222e;
    --ring: #7d95ff;
    --shadow: rgba(0,0,0,.7);
    background: radial-gradient(44rem 24rem at 50% 0%, #171c28, var(--bg) 74%);
  }

  .sb-14:not([data-theme="light"]) .sb-14__box:hover {
    background: #232a38;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sb-14 *,
    .sb-14 *::before,
    .sb-14 *::after {
    transition: none !important;
    animation: none !important;
  }
}

@media (forced-colors: active) {
  .sb-14__toolbar,
    .sb-14__box,
    .sb-14__btn {
    border: 1px solid CanvasText;
  }
}

.sb-14__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-14[data-theme="dark"] .sb-14__theme {
  background: rgba(20,20,28,.72);
  border-color: rgba(255,255,255,.15);
  color: #fff;
}

@media (prefers-color-scheme: dark) {
  .sb-14:not([data-theme="light"]) .sb-14__theme {
    background: rgba(20,20,28,.72);
    border-color: rgba(255,255,255,.15);
    color: #fff;
  }
}

.sb-14__theme:hover {
  transform: translateY(-1px);
  border-color: rgba(0,0,0,.24);
}

.sb-14[data-theme="dark"] .sb-14__theme:hover,
.sb-14:not([data-theme="light"]) .sb-14__theme:hover {
  border-color: rgba(255,255,255,.3);
}

.sb-14__theme:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

.sb-14__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-14__sun {
  display: none;
}

.sb-14__theme[aria-pressed="true"] .sb-14__sun {
  display: block;
}

.sb-14__theme[aria-pressed="true"] .sb-14__moon {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .sb-14__theme {
    transition: none;
  }

  .sb-14__theme:hover {
    transform: none;
  }
}
```

## JavaScript
```js
(()=>{const r=document.querySelector('.sb-14');if(!r)return;const t=r.querySelector('.sb-14__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

The label is the trigger. A <label for="…"> wrapping the magnifier focuses the input on click, which fires :focus-within, which expands the box. No click handler, no tabindex, and it works with touch, mouse and keyboard identically:

.sb-14__box{inline-size:44px; transition:inline-size .34s cubic-bezier(.2,.9,.25,1);}
.sb-14__box:focus-within{inline-size:min(22rem,60vw);}
.sb-14__input{opacity:0; transition:opacity .18s;}
.sb-14__box:focus-within .sb-14__input{opacity:1; transition-delay:.12s;}

The transition-delay on the input is the detail that makes it feel designed: text fades in after the box has started opening, instead of squeezing against the closing edge.

Why not width:0? A zero-width input cannot be focused on iOS and disappears from the hit-testing grid. Collapsing to a 44px circle keeps the control tappable and keeps the caret inside the box when the keyboard opens.

Make it yours

  • Set the open width once, in the :focus-within rule — min(22rem,60vw) keeps it inside small viewports.
  • To keep it open while it has content, add .sb-14__box:has(.sb-14__input:not(:placeholder-shown)){inline-size:min(22rem,60vw)}.
  • Expand leftwards in an end-aligned toolbar by adding margin-inline-start:auto to the box; the transition is direction-agnostic.
  • Drop the surrounding toolbar chrome to use the control standalone — only .sb-14__box and its children matter.

Gotchas — read before shipping

  • Never animate width on an element containing text you want to stay legible — clip it with overflow:hidden on the box, as here, or glyphs will spill during the transition.
  • A collapsed search that is smaller than 44px fails WCAG 2.2 target size and is miserable on touch.
  • :focus-within collapses the moment focus leaves, which discards a typed query. Pair it with the :has() rule above in production.
  • Do not swap display:none on the input when collapsed — it becomes unfocusable and the label stops working.

Browser support

ChromeSafariFirefoxEdge
105+15.4+121+105+

:focus-within and inline-size transitions work in every current browser (Chrome 60 / Safari 10.1 / Firefox 52). The optional keep-open-when-filled rule needs :has() — Chrome 105 / Safari 15.4 / Firefox 121 — and degrades to the plain collapse behaviour.

Techniques used in this demo

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

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