Disclosure button.
Shows or hides a related section of content.
See it in context
What it is
A disclosure control makes extra information available without leaving the current page. Its expanded state communicates whether the controlled content is visible.
When to use it
Associate the opener with its content and expose its expanded state.
Know the difference
A menu button opens commands; a disclosure button reveals ordinary related content.
Across platforms
Web
Use a native button for an action and an anchor for navigation. Preserve keyboard activation and a visible focus indicator.
iOS · iPadOS · Android
Provide a comfortable touch target, use familiar system symbols when appropriate, and show a clear pressed or selected state.
macOS · Windows · Linux
Keep pointer, keyboard, and focus behavior consistent. Common commands can additionally expose a menu item or keyboard shortcut.
Go to the source
Primary documentation for the pattern and its platform conventions.