SVG fundamental
This example demonstrates how to render a minimal SVG-based visualization using D3 version 7. It shows the basic structure of an HTML document with SVG capabilities, though the initial body content is replaced by JavaScript. The code uses the `d3.select` API to target the `body` element and its `.text` method to display the string "Hello D3 version 7". The rendering approach highlights the simplicity of setting up an SVG context in a web page with a single JavaScript file.