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Avalonia is a cross-platform desktop framework that enables the creation of native-feeling applications for Windows, macOS, and Linux from a single codebase. It functions as a declarative UI toolkit, allowing developers to define complex visual hierarchies and interface structures using a markup-based syntax that maps directly to underlying object properties. By utilizing the Model-View-ViewModel architectural pattern, the framework facilitates a clean separation between application logic and user interface layout, which simplifies unit testing and component maintenance. The framework disting

Defines target controls for styling rules using selectors that match types, classes, or properties.

GrapesJS is a modular, web-based visual editor framework designed for building drag-and-drop page builders and custom content management interfaces. It functions as a structural engine that manages hierarchical document models, allowing developers to create reusable design blocks and complex page compositions. By providing a schema-driven approach to UI configuration, the framework enables the construction of design environments where users can assemble layouts and manage component properties visually without writing raw code. The project distinguishes itself through a highly extensible, plug

The editor includes tools for tracking element selection states and applying reusable CSS classes to maintain consistent visual styling throughout the editing process.