This example demonstrates embedding D3.js directly within an HTML page, displaying a large “Hello HTML!” message styled with CSS. The code imports `select` from D3 and ES6 modules from separate JavaScript files, logging composed strings and the imported function to the console. It uses D3 v6 loaded via a CDN, alongside a bundled local script, showing how to structure small multi-file projects with modular imports and exports. The visualization itself is static, focusing on setup and module wiring rather than interactive data rendering.