This example demonstrates how to draw a bar with rounded top corners using an SVG path in D3 v5. The code constructs the path manually with an `M`, `h`, `v`, and `a` command sequence, applying elliptical arc segments to create the rounded corners. It uses `d3.select` to append the path to an SVG container, with corner radius and bar dimensions defined as variables. The path handles both positive and negative bar heights by adjusting the arc sweep flag, while the bar itself is stroked in black with no fill.