This example demonstrates a financial data visualization tool that loads CSV data and displays a summary of row and column counts in a styled message container. Users can look up stock symbols, triggering an interactive line chart showing six months of price data, alongside a formatted preview table of the first ten CSV rows. The code relies on D3 v7 for all data processing and rendering, using `d3.csv` for parsing, `d3.select` for DOM manipulation, and SVG axes for the chart. Data originates from Stooq's daily CSV API accessed through an AllOrigins proxy.