This example demonstrates a simple D3.js starter template that creates a vertical series of 100 rectangular bars across the full width of the viewport. The visualization uses D3’s selection and data-join API (`select`, `selectAll`, and `join`) to generate SVG rectangles positioned by their `y` attribute, with each bar spaced 20 pixels apart. The code initializes an empty SVG element within the page body and relies on D3 version 7.8.2, loaded via CDN, to construct the graphic without any external data source.