This example demonstrates a simple D3.js visualization that displays a purple circle in an SVG container alongside a text message. The code imports the `select` function from D3 v5 and uses it to update the message div with a string from a local ES6 module. The SVG renders a circle with fixed coordinates and radius, while CSS styles the page with a dark background and Ubuntu font. It serves as a minimal template for combining D3 selections, SVG shapes, and modular JavaScript.