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v2.2.1
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Collapsible Component

A lightweight, accessible collapsible component built with native HTML details and summary elements. Expand and collapse content sections for FAQs and progressive disclosure patterns. Zero JavaScript needed—fully keyboard-accessible with smooth transitions and Tailwind CSS styling.

Collapsible components allow users to expand and collapse sections of content. Built with a hidden checkbox pattern, collapsibles work without any JavaScript and support animated transitions via CSS grid.

Class Type Description
collapsibleBaseCollapsible container driven by a hidden checkbox
collapsible-toggleModifierHidden checkbox input that controls open/close state
collapsible-titleModifierClickable label that toggles the collapsible
collapsible-contentModifierAnimated content area revealed when open
collapsible-arrowModifierAdds a rotating arrow indicator to the title
collapsible-groupModifierWrapper for accordion-style grouped collapsibles
collapsible-overlayModifierOverlay variant for drawer-style collapsibles
collapsible-peekModifierShows a glimpse of content when collapsed
is-collapsible-openModifierJS-applied class to force open state
is-collapsible-closeModifierJS-applied class to force closed state

Basic Usage

A hidden checkbox drives the open/close state. The label triggers it; the collapsible-content div animates open.

This content is hidden until expanded. 
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<div class="collapsible border border-base-soft rounded-lg">
  <input type="checkbox" class="collapsible-toggle" id="col-basic" />
  <label for="col-basic" class="collapsible-title px-4 py-3 font-medium">Click to expand</label>
  <div class="collapsible-content">
    <div>
      <div class="px-4 pb-3 text-sm opacity-70">
        This content is hidden until expanded.
      </div>
    </div>
  </div>
</div>

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import { useCollapsible } from 'frutjam/react'

export default function CollapsibleDemo() {
  const collapsible = useCollapsible()
  return (
    <div ref={collapsible.ref} className="collapsible border border-base-soft rounded-lg">
      <button className="collapsible-title px-4 py-3 font-medium" onClick={collapsible.toggle}>Click to expand</button>
      <div className="collapsible-content">
        <div>
          <div className="px-4 pb-3 text-sm opacity-70">
            This content is hidden until expanded.
          </div>
        </div>
      </div>
    </div>
  )
}

With Arrow Indicator

Add collapsible-arrow to the label to get a rotating chevron that reflects open/close state.

Frutjam is a Tailwind CSS v4 component library built with CSS utilities and a PostCSS plugin.
html 
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<div class="collapsible border border-base-soft rounded-lg">
  <input type="checkbox" class="collapsible-toggle" id="col-arrow" />
  <label for="col-arrow" class="collapsible-title collapsible-arrow px-4 py-3 font-medium">What is Frutjam?</label>
  <div class="collapsible-content">
    <div>
      <div class="px-4 pb-3 text-sm opacity-70">
        Frutjam is a Tailwind CSS v4 component library built with CSS utilities and a PostCSS plugin.
      </div>
    </div>
  </div>
</div>

Multiple Collapsibles

Content for the first section.
Content for the second section.
Content for the third section.
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<div class="flex flex-col gap-2">
  <div class="collapsible border border-base-soft rounded-lg">
    <input type="checkbox" class="collapsible-toggle" id="col-1" />
    <label for="col-1" class="collapsible-title collapsible-arrow px-4 py-3 font-medium">Section One</label>
    <div class="collapsible-content">
      <div>
        <div class="px-4 pb-3 text-sm opacity-70">Content for the first section.</div>
      </div>
    </div>
  </div>

  <div class="collapsible border border-base-soft rounded-lg">
    <input type="checkbox" class="collapsible-toggle" id="col-2" />
    <label for="col-2" class="collapsible-title collapsible-arrow px-4 py-3 font-medium">Section Two</label>
    <div class="collapsible-content">
      <div>
        <div class="px-4 pb-3 text-sm opacity-70">Content for the second section.</div>
      </div>
    </div>
  </div>

  <div class="collapsible border border-base-soft rounded-lg">
    <input type="checkbox" class="collapsible-toggle" id="col-3" />
    <label for="col-3" class="collapsible-title collapsible-arrow px-4 py-3 font-medium">Section Three</label>
    <div class="collapsible-content">
      <div>
        <div class="px-4 pb-3 text-sm opacity-70">Content for the third section.</div>
      </div>
    </div>
  </div>
</div>

Open by Default

Add checked to the checkbox input to start the panel open.

This content is visible on initial load.
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<div class="collapsible border border-base-soft rounded-lg">
  <input type="checkbox" class="collapsible-toggle" id="col-open" checked />
  <label for="col-open" class="collapsible-title collapsible-arrow px-4 py-3 font-medium">Open by default</label>
  <div class="collapsible-content">
    <div>
      <div class="px-4 pb-3 text-sm opacity-70">
        This content is visible on initial load.
      </div>
    </div>
  </div>
</div>

JS Controlled

Toggle collapsible-open on the wrapper element instead of using a checkbox — useful when the trigger lives elsewhere.

No hidden checkbox needed — state is managed by the collapsible-open class.
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<div class="collapsible collapsible-open border border-base-soft rounded-lg" id="js-col">
  <button
    class="collapsible-title collapsible-arrow px-4 py-3 font-medium"
    onclick="this.closest('.collapsible').classList.toggle('collapsible-open')"
  >
    Toggle via JS (starts open)
  </button>
  <div class="collapsible-content">
    <div>
      <div class="px-4 py-3 text-sm opacity-70 border-t border-base-soft">
        No hidden checkbox needed — state is managed by the <code>collapsible-open</code> class.
      </div>
    </div>
  </div>
</div>

Peek Variant

collapsible-peek shows a clipped preview with a gradient fade and an overlay trigger. Override --peek-height to control how much content is visible when collapsed.

Frutjam is a Tailwind CSS v4 component library built around a PostCSS plugin architecture. Every component is a set of @utility definitions that integrate natively with Tailwind's utility pipeline.

Theming is handled entirely through CSS custom properties. Swap themes by setting a data-theme attribute on any container, or override individual tokens inline.

Components ship with sensible defaults and are designed to compose cleanly.

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<div class="collapsible collapsible-peek rounded-xl border border-base-soft" style="--peek-height: 5rem;">
  <input type="checkbox" class="collapsible-toggle" id="col-peek" />
  <div class="collapsible-content">
    <div class="p-4 text-sm leading-relaxed">
      <p>Frutjam is a Tailwind CSS v4 component library built around a PostCSS plugin architecture. Every component is a set of <code>@utility</code> definitions that integrate natively with Tailwind's utility pipeline.</p>
      <p class="mt-3">Theming is handled entirely through CSS custom properties. Swap themes by setting a <code>data-theme</code> attribute on any container, or override individual tokens inline.</p>
      <p class="mt-3">Components ship with sensible defaults and are designed to compose cleanly.</p>
    </div>
  </div>
  <label for="col-peek" class="collapsible-overlay">
    <span class="btn btn-sm">Read more</span>
  </label>
</div>

JS & React Helper

Use createCollapsible from frutjam/js or useCollapsible from frutjam/react for programmatic control and automatic aria-expanded sync on any trigger.

Controlled section
Toggled by the external button above.
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<button class="btn btn-sm mb-3" id="col-helper-btn">Toggle</button>
<div class="collapsible border border-base-soft rounded-lg" id="js-collapsible">
  <div class="collapsible-title collapsible-arrow px-4 py-3 font-medium">Controlled section</div>
  <div class="collapsible-content">
    <div>
      <div class="px-4 pb-3 text-sm opacity-70">Toggled by the external button above.</div>
    </div>
  </div>
</div>
<script type="module">
  import { createCollapsible } from 'frutjam/js'
  const col = createCollapsible(document.getElementById('js-collapsible'))
  document.getElementById('col-helper-btn').onclick = () => col.toggle()
</script>

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import { useCollapsible } from 'frutjam/react'

export default function CollapsibleDemo() {
  const collapsible = useCollapsible()
  return (
    <>
      <button className="btn btn-sm mb-3" onClick={collapsible.toggle}>Toggle</button>
      <div ref={collapsible.ref} className="collapsible border border-base-soft rounded-lg">
        <div className="collapsible-title collapsible-arrow px-4 py-3 font-medium">Controlled section</div>
        <div className="collapsible-content">
          <div>
            <div className="px-4 pb-3 text-sm opacity-70">Toggled by the external button above.</div>
          </div>
        </div>
      </div>
    </>
  )
}

External Trigger with collapsible-group

Wrap a trigger and a collapsible in collapsible-group to let labels outside .collapsible respond to its open/close state via is-collapsible-open and is-collapsible-close.

Section A
This content is toggled by the button above, which lives outside .collapsible but inside .collapsible-group.
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<div class="collapsible-group border border-base-soft rounded-lg p-4 flex flex-col gap-3">
  <div class="flex items-center justify-between">
    <span class="font-medium">Section A</span>
    <label for="cg-1" class="btn btn-sm btn-ghost">
      <span class="is-collapsible-close">Expand</span>
      <span class="is-collapsible-open">Collapse</span>
    </label>
  </div>
  <div class="collapsible">
    <input type="checkbox" class="collapsible-toggle" id="cg-1" />
    <div class="collapsible-content">
      <div>
        <div class="text-sm opacity-70">
          This content is toggled by the button above, which lives outside <code>.collapsible</code> but inside <code>.collapsible-group</code>.
        </div>
      </div>
    </div>
  </div>
</div>