An expand/collapse widget lets users reveal or hide additional information on demand. The native HTML details element provides built‑in keyboard and accessibility support across modern browsers.
This example uses a button to toggle the visibility of a container with class “details”. It manages the hidden state and updates aria-expanded for screen readers.
You can place any content here, including images, lists, and forms.
This panel demonstrates a lightweight animated reveal using CSS grid trickery. When opened, the container smoothly transitions from collapsed to expanded.
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