Overlays & Surfaces · Containers
Disclosure
also known as disclosure widget, show/hide
A disclosure is a button that toggles the visibility of a related chunk of content, revealing details on demand and hiding them to reduce clutter. It's the accessibility term (ARIA 'disclosure' pattern) for a self-contained show/hide toggle. Expander and collapsible are common informal names for the same idea.
See it live — shadcn/ui · MUI · Ant Design
Don't confuse it with
A disclosure controls one independent section; an accordion coordinates several disclosures as a group (often single-open). 'Expander' and 'collapsible' are everyday synonyms for a disclosure. The accessibility spec uses the word 'disclosure'.
In the wild
A 'Show more' link that expands extra product details is a disclosure.