This example demonstrates the simplest possible D3 setup by rendering the text “Hello D3 version 7” directly in the browser body. It uses the `select` function from D3 v7 to target the `body` element and `.text()` to set its content. The HTML page loads D3 from a CDN and includes a separate JavaScript file, while the CSS applies a large centered font size. No data or interactive elements are involved, focusing purely on initializing a D3 project.