This stacked area chart displays multiple time series as layered filled regions, with each line segment connecting data points to form a cumulative total across categories. The single SVG element contains black polylines that trace the boundaries of each layer, drawn directly via inline SVG `<line>` elements without any JavaScript visualization library. The chart uses raw SVG coordinate attributes to plot the series, with a white background and clipped to a fixed viewBox, though no axis labels or legend are included to identify the data values.