This example demonstrates how to load and display a simple text message using D3.js within a modular ES6 setup. The code imports the `select` function from D3 and a local `message` string from a separate module, then updates a `<div>` element’s text content on the page. It showcases both CDN-based library loading via UNPKG and local ES6 module imports, with styling applied through an external CSS file. No data visualization or rendering beyond this basic DOM manipulation is shown.