This example demonstrates the simplest possible D3 setup by rendering the static text “Hello D3 version 7” in the center of the page using a 13-em font size. The code relies on D3 version 7’s `select` method to target the `<body>` element and set its text content, while the HTML document loads the library from the unpkg CDN. It serves as a foundational template, showing only the basic structure of a D3 project without any data or interactive behavior.