This example demonstrates the simplest possible D3 version 6 program: it selects the body element and writes the text “Hello D3 version 6” directly into it. The code uses the `select` function from the D3 library and the `text` method to set the content. The entire visualization is a static text output, with no data binding, scales, or interactive elements. The HTML page loads D3 v6 from a CDN and runs the bundled JavaScript file to produce the result.