This area chart displays the price of a commodity over time using a green filled area beneath a line. The visualization is built with D3.js v4 and rendered as an SVG. The code fetches market-price data from a GitHub gist, parses the date strings with `d3.timeParse`, and constructs the chart using `d3.scaleTime`, `d3.scaleLinear`, and `d3.area`. Axis labels are added via SVG text elements, and the styling is defined in a separate CSS file.