This example displays the text “Hello D3 version 7” centered on a plain web page, serving as a minimal starting point for the D3 version 7 library. The page’s body is styled with a font size of 13em and text alignment centered, while the JavaScript uses the `d3.select` API to target the body element and apply the string via the `.text()` method. The code imports D3 from a CDN (unpkg) and also loads a separate `bundle.js` file, though that script’s contents are not shown here.