This example presents a demonstration webpage that showcases the size and structure of a student course performance dataset. The page displays a static classroom SVG image alongside a summary of the loaded CSV data, including its file size in kilobytes, row count, and column count. The code uses the D3.js v7 `d3.csv` and `d3.csvFormat` APIs to fetch and measure the dataset from a GitHub-hosted CSV file, then inserts the calculated text into a styled `<pre>` element. The page is built with minimal HTML, CSS, and JavaScript.