This example displays a simple bar chart of country populations using D3, with steelblue bars that turn brown on hover. The chart reads from a local `data.json` file containing country names and population values, though the HTML page itself initially renders "Hello HTML" in large text. The code sets up SVG margins and axes within an HTML starter template, using D3's bar and axis APIs to visualize the data. The page serves as a bare minimum starting point for HTML-based visualizations.