This example demonstrates a minimal D3 version 7 setup that displays the text “Hello D3 version 7” in the center of the page using a 13-em font size. The implementation uses the `select` function from D3 to target the `body` element and sets its text content, with the page importing D3 from a CDN. The code shows the basic structure of a D3 project, including an HTML file with a script tag for D3 and a separate JavaScript module that imports the select function. It serves as a simple starting point for learning D3’s core selection and DOM manipulation API.