This example demonstrates a minimal D3.js visualization that renders a message on a web page using ES6 module imports. The code imports the `select` function from D3 and a custom message from a local module, then updates the text content of a `<div>` element using D3’s selection API. Styling is handled through an external CSS file with the `#message` selector. The visualization relies on the D3 v5 library loaded via UNPKG and includes a regular expression and a static variable that do not affect the rendered output.