Components

Collapsible

Shows and hides one section of content.

28 October 2026

Added

First version: Collapsible, CollapsibleTrigger, CollapsiblePanel on Base UI Collapsible.
open, defaultOpen, onOpenChange and disabled; chevron on the trigger; hiddenUntilFound and keepMounted on the panel.
On open the content fades in and drops 4 px; the chevron turns half a turn. The height is not animated.
A closed panel carries hidden="until-found" by default; find in page opens it.