Layout / The visual dictionary
Resizable pane.
A content region whose size can be changed by dragging its boundary.
Also calledsplitterresize divider
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UI illustrationSee it in context
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What it is
A content region whose size can be changed by dragging its boundary. Provide a clear divider handle, minimum sizes, and a usable default split.
When to use it
Use it when people need to allocate screen space between related tasks.
Know the difference
Not every split view is resizable; resizing describes an additional interaction.
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Across platforms
WebmacOSWindowsLinux
Web · macOS · Windows · Linux
Desktop pointer interfaces commonly support dragging; narrow touch layouts typically replace resizing with navigation.
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Go to the source
Primary documentation for the pattern and its platform conventions.