This combined chart displays monthly car sales as blue bars on a left axis and a satisfaction score as a pink line on a right axis. The visualization uses D3 v7 to load a CSV from a GitHub gist, then renders with SVG. It employs `d3.scaleBand` for the x-axis months and separate `d3.scaleLinear` scales for the two y-axes, with gridlines, rotated tick labels, and a legend.