This annotated bar chart demonstrates foundational SVG construction using D3.js v7. The visualization combines manually positioned bars with a hand-drawn polyline path and intricate marker annotations created through SVG path data. The code applies CSS classes for styling elements like the yellow-highlighted first bar, while inline attributes control fill colors, opacity, and stroke properties. The example serves as a pedagogical introduction to creating static vector graphics, using raw SVG elements rather than D3’s higher-level chart abstractions.