This visualization shows stacked area trends in regional housing prices over time, with each colored band representing a different region’s price contribution to the total. The chart uses d3.area with curveMonotoneX to draw smooth, gradient-filled paths, and d3.stack to aggregate the regional series. Data is loaded via d3.csv from a remote gist, then grouped by region and date using d3.group. Axes are rendered with d3.axisBottom and d3.axisLeft, while price values are scaled linearly against a time-based x-scale.