This example demonstrates a minimal D3.js setup within a React project, rendering a red SVG rectangle and adding a text paragraph to the page. The code uses `select` from D3 v5 to target the existing SVG element and apply inline styling, while also appending a new paragraph to the DOM. The visualization shows basic SVG rendering with D3’s selection API, using a static HTML page with a bundled JavaScript file. The rendering approach relies on SVG elements and D3’s DOM manipulation methods.