Two side-by-side pairs of geometric shapes—a rectangle, circle, and irregular polygon—demonstrate the visual difference between a solid fill and a combined fill-and-stroke treatment. The top row uses default black fills, while the lower row applies a white fill with a thick black stroke, as defined by SVG presentation attributes. The irregular polygons are hand-coded Bézier paths with explicit control-point coordinates, not generated by a data library. This static SVG example relies on direct markup, with no JavaScript or external visualization APIs.