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VvvebJs is a WYSIWYG web page builder that enables drag-and-drop creation of responsive websites using Bootstrap components. The system provides a visual editor with canvas, property panels, component library, and file management for constructing HTML pages. Key features include inline text editing, code viewing via CodeMirror, media handling, undo/redo functionality, and export capabilities. The architecture follows a modular pattern with core builder logic in libs/builder/builder.js, extensible via plugins and component definitions. Entry points include editor.html for initialization, save.php/save.js for persistence, and upload.php/scan.php for media management. The builder manipulates an iframe as the design canvas while maintaining component state and history for undo/redo operations.