This area chart from Msahith123 visualizes yearly cost data from a CSV file. The blue-green filled path, generated with `d3.area()`, shows a clear trend across years, reaching its peak in 2007. Interactive invisible circles, rendered with D3’s data join, trigger a lightsteelblue tooltip on mouseover to display the year and cost. The visualization uses linear scales for both axes, with SVG rendering and D3 v6. An accompanying README notes the design is responsive, though the version here uses fixed dimensions.