This example demonstrates a nested tabbed view interface where users can switch between multiple panels. The outer TabbedView creates three tabs (first, second, third), and within the second tab, an inner TabbedView contains three additional tabs (one, two, three). The implementation uses d3.v7 to dynamically construct the DOM hierarchy, with a BlankLayout managing the overall viewport size. The code defines reusable layout components with customizable header, footer, and tab positioning (Left, Inner, Right), demonstrating a modular approach to building complex, resizable data visualization interfaces.