This example displays a single heading that reads “Hello D3 version 7” in large, centered text on a blank white page. It demonstrates the basic setup of a D3 project by linking to the D3 v7 library via a remote script tag and applying a selection API call. The `select('body')` method is chained with `.append("h6")` and `.text()` to inject the heading into the document’s body, illustrating the simplest pattern for using D3 v7 with an HTML file and an external JavaScript bundle.