This line chart visualizes US cancer cases from 2009 to 2022, plotting yearly case counts as a red path. The code uses d3.csv to load data from a GitHub gist, then applies d3.scaleTime and d3.scaleLinear for the axes, with d3.axisBottom and d3.axisLeft generating gridlines. A d3.line generator maps years to x-coordinates and case numbers to y-coordinates within an SVG, with margins and axis labels styled via external CSS.