This example demonstrates how to load and parse CSV data using D3.js v7, displaying a summary of the dataset's size, row count, and column count in a styled HTML page. The code fetches a remote CSV file from a gist URL using `d3.csv`, then formats and calculates the data size with `d3.csvFormat`. The visualization also includes an inline SVG city illustration, with the summary text rendered in a `<pre>` element using standard DOM manipulation. The page uses minimal CSS for typography and background styling.