This example demonstrates a minimal HTML page with SVG rendering, featuring three concentric circles drawn at two horizontal positions and a closed blue curve through a diamond-shaped path. It shows how D3.js version 6 can select DOM elements, bind data arrays, and append shapes with dynamic attributes. The circles use transparent fills with black strokes, while the line graph employs d3.line() with curveBasis interpolation. The code mixes vanilla JavaScript with D3 selections, logging "Hello JavaScript!" to the console after rendering.