This example shows a minimal line chart built with raw SVG, not a traditional D3.js construction. The visualization plots five data points connected by a thick black path, where the stroke width and rounded line joins visually emphasize the connecting segments. The code uses an inline SVG element with a `path` that defines the line’s geometry via `M` and `L` commands. Although the title mentions D3, no D3 library is actually loaded; instead, the implementation relies solely on native SVG properties like `stroke`, `stroke-width`, and `stroke-linejoin` to create the appearance of a line chart. The data is hardcoded as coordinates in the path definition.