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A data-driven HTML/CSS UI framework for games and real-time applications.
Unreal Engine · Unity · C++ · C#
Documentation · Unreal Engine · Unity · Issues
Markup UI uses HTML for interface structure and CSS for layout and styling. Hardware-accelerated rendering, data binding, and commands connect those interfaces to application logic. Build menus, inventories, settings panels, and other game interfaces while keeping page design separate from C++ or C# code.
- HTML and CSS — define page structure, reusable styles, layouts, and assets.
- Data binding — connect text, attributes, styles, conditions, and collections to application data.
- UI interaction — write input values back to models and invoke commands from UI events; use triggers to connect application events to page behaviors.
- Engine integration — work with Unreal Engine through UMG and with Unity through UI Toolkit, including engine-specific asset and preview workflows.
- C++ and C# — expose observable data and typed commands through the SDK and engine integrations.
Blueprint support connects interfaces to gameplay logic: bind Blueprint object properties, invoke Blueprint functions from page events, and send property change notifications through Blueprint nodes. Display HTML interfaces in UMG and preview pages in the editor, with C++ properties, UFUNCTION commands, and extension properties available for integration with existing game systems.
Install · Create your first interface · Display in UMG
Watch the Unreal Engine quick start on YouTube
Display HTML interfaces through UI Toolkit, synchronize page assets into the project, and preview them in the editor. Use C# data models and commands to connect interfaces to application logic.
Install · Create your first interface · Integrate with UI Toolkit
Templates describe what the interface displays. Data binding keeps page content connected to observable application data, while two-way binding writes user input back to the model. Commands let UI events invoke business operations; triggers let application events execute behaviors on page elements.
This supports interfaces such as inventories, player status panels, settings screens, and in-game menus, with presentation defined in HTML/CSS and application behavior implemented in C++ or C#.
Write your first page · Data binding · Events and commands · Triggers
Report bugs, ask questions, or suggest features in Issues.