This example displays the text “Hello D3 version 7” centered on a blank page, using D3 v7.6.1 loaded from a CDN, with a font size set to 13em. The single-page HTML file uses the D3 `select` method to target the body element and set its text content. The page is styled with a simple CSS rule, and a separate `bundle.js` file is referenced but not shown in the provided code.