This example demonstrates how to create a stylized line chart from a small set of six manually defined x-y coordinates. Rather than using standard axes or gridlines, the visualization relies on a single thick black polyline rendered as an SVG path element. The code uses D3.js version 7.8.5, specifically the `line()` generator from `d3-shape`, which constructs the path data from the data points. The path is styled with a 55-pixel-wide stroke, round line caps and joins, and no fill, producing a bold, continuous line across the container.