This line chart shows a jagged polyline connecting five points across a white canvas, with a single black stroke of 20-pixel width tracing an upward and downward path. The chart is rendered as static SVG markup directly in the HTML, using a `path` element with explicit coordinates and a `rect` background. No JavaScript libraries are involved; the example relies on raw SVG geometry and minimal CSS for text styling, with an unused `index.js` that merely logs a message.