The triangle chart uses two SVG <path> elements to draw filled triangular forms. The first path, filled with a dark blue, traces a large triangle; the second, lighter blue path overlays a smaller, inset triangle. Both paths are defined using the SVG `d` attribute with relative (`l`) and absolute (`L`) line commands. The code is straightforward, with no external libraries, and uses the inline `<svg viewBox>` coordinate system to position shapes.