This example demonstrates how to traverse and render a hierarchical tree structure using D3.js’s `d3.hierarchy` API. It visualizes nested data objects as a series of stacked, blue-bordered `div` elements, where each level of nesting corresponds to a deeper layer of the tree. The code builds the hierarchy from a static raw JavaScript object, then uses `d3.select` and `.append()` to create the DOM nodes, with each element’s text set to the node’s name. The console logs the depth and name of each visited node, illustrating the traversal order.