A scatterplot matrix displays nutritional data for McDonald’s menu items from a CSV file, using JavaScript’s `import` statement to load the data and coercing string values to numbers. The example shows the first item’s values in a JSON format, with the main function writing directly to a container using a template literal and a `pre` element with a fixed font size. The code defines a list of quantitative attributes and logs the keys to the console, but does not render any visual chart.