This example demonstrates the simplest possible D3 setup, displaying the static text “Hello D3 version 7” centered in the browser window. It uses the D3 v7 library, loaded via a CDN, and the `select` API from that library to target the body element and set its text content. The page is styled with CSS for large, centered typography, and the visualization logic is separated into an external JavaScript file. No data source or dynamic rendering is involved; it serves purely as a minimal template for verifying D3 installation.