This example demonstrates the simplest possible D3 version 7 setup: it renders the text “Hello D3 version 7” in the browser body using a font size of 11em. The index.html file loads D3 7.6.1 from unpkg, while index.js imports the `select` function from D3 and applies the text content directly to the page. No data, scales, or interactive elements are involved, making it a minimal starter template for testing the D3 environment.