This visualization displays a stacked area chart of stock prices over time, showing how each category contributes cumulatively to the total. It uses a time-scaled x-axis and a linear y-axis with gridlines, and includes a legend positioned at the right side. The code loads CSV data from a remote gist, parses dates, and nests the data by symbol. It computes the sum of other categories for each point to create the stacked effect, then renders the areas using `d3.area` with a basis curve, filling each series with a categorical color from `d3.schemeCategory10`.