This example displays two D3.js v7 visualizations in a single SVG: a pie chart categorizing stock closing prices into three ranges and an area chart showing closing prices over time. The pie chart uses `d3.pie` and `d3.arc` with ordinal color scaling, while the area chart employs `d3.area` and `d3.scaleTime`/`d3.scaleLinear` axes. Both render from the same CSV dataset fetched via `d3.csv`, showing the date and closing price values.