This example demonstrates a minimal D3.js visualization that renders a text message centered on the page. The code imports the `select` function from D3 and a local ES6 module exporting a string, then uses `select('#message').text(message)` to display the text. It loads D3 v5 from a CDN via UNPKG and includes a CSS file for styling. A regular expression and numeric variable are declared but unused, showing basic JavaScript syntax alongside the core D3 selection and manipulation approach.