This example is a minimal hello-world visualization that displays the text “Hello D3” centered on a blank page. It demonstrates the basic setup of a D3 v7 project using an ES module import and an import map. The page uses a `d3.select` call from the `d3` library to target the `body` element and set its text content. The HTML file defines the layout with a large font size, while the JavaScript file contains the single line of code that renders the output. The example serves as a starting point for building more complex D3 visualizations.