A minimal demonstration of D3 v7 data binding and DOM manipulation. The page renders three paragraph elements, each displaying the numbers 1, 2, and 3 from a small array, with custom font sizing applied via `d3.select` and the `data()`, `enter()`, and `append()` APIs. The example uses the `d3.min.js` library from unpkg and a separate `bundle.js` script, with styling defined in the HTML head. It serves as a basic starting point for building interactive visualizations with D3's selection and join methods.