This example shows a stylized bar chart of population data for the world’s most populous countries, with each bar rendered as a fixed 300-by-300 square rather than a proportional rectangle. The visualization uses D3 v5’s `select` and `csv` methods to load the data from `data.csv`, parse population values by multiplying them by 1000, and append SVG `rect` elements to the chart. Although the bars are all equal in size, the code demonstrates a basic data-binding workflow with D3’s enter selection, leaving the styling and scaling intentionally incomplete.