This example demonstrates fundamental SVG shape rendering and styling using D3.js. It shows how paths create geometric forms, including a red triangle, blue cross, and orange polygon, with filled and stroked variants. The code uses `d3.select` and `.append('path')` to add SVG elements dynamically, while static paths are defined directly in the HTML. Attributes such as `d`, `fill`, `stroke`, and `stroke-width` control shape geometry and appearance, highlighting the different behaviors of closed paths versus open strokes.