This example demonstrates how to build a simple bar chart showing the 2018 population estimates for the top ten most populous countries, using a dataset from the United Nations World Population Prospects. The visualization initially renders all bars with a fixed width and height of 300 pixels, using D3 v5’s `selectAll` and `data` join to append SVG `rect` elements. The code includes a `scaleLinear` instance that maps a domain of 0 to 100 to a range of 0 to 30, though it is not yet applied to the bar dimensions. The data is loaded from a CSV file and parsed by converting the population string to a number multiplied by 1000.