This example shows a minimal D3 setup that renders the text “Hello D3 version 7” centered on a blank page. The page loads D3 v7 from a CDN and then, using the `select` function, targets the body element to set its text content. It demonstrates the basic pattern of importing a D3 module and applying a simple DOM update, serving as a starting point for beginners exploring D3 version 6 or 7. The code relies on the `d3.select` API for element selection and text insertion.