This example demonstrates a minimal SVG visualization where fifteen circles with a radius of 100 pixels are drawn across the full browser viewport. The code uses D3 version 7.4.4's `select`, `range`, and `selectall` APIs to append circles to the SVG container, with dimensions taken directly from `window.innerWidth` and `window.innerheight`. The visualization is embedded within a React 18.1.0 project, though the rendering itself relies solely on D3's selection and data-binding methods rather than React components.