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Aside
Secondary contextual area.
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Canvas
Free-form visual workspace.
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Card
Self-contained content/action block.
Core -
Column
Vertical grouping.
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Container
Wrapper limiting content width.
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Content Area
Main application content region.
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Dashboard
Collection of information widgets.
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Divider
Visual separation between sections.
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Fixed Header
Header positioned independently of normal document flow.
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Footer
Bottom-level page information/navigation.
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Grid
Two-dimensional layout system.
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Header
Top-level page/application header.
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Hero
Prominent introductory section.
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Inspector
Contextual panel for viewing/editing object properties.
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Main Content
Primary information/task area.
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Master/Detail
List/master area paired with selected-item details.
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Navigation Rail
Compact vertical navigation.
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Panel
Bounded area containing related information.
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Property Panel
Panel containing object attributes/settings.
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Row
Horizontal grouping.
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Sidebar
Vertical navigation or contextual panel.
Core -
Spacer
Intentional empty space used for layout.
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Split Pane
Resizable two-panel layout.
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Stack
Consistent vertical/horizontal arrangement.
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Sticky Header
Header remaining visible while scrolling.
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Tile
Prominent compact card-like UI block.
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Topbar
Horizontal application toolbar.
Core -
Viewport
Visible browser area.
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Workspace
Persistent application environment containing tools/content.
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Wrapper
Generic grouping/layout container.