Customizing Axes!
A bar chart displays the population of the top 10 most populous countries using 2018 estimates from the United Nations World Population Prospects. It shows horizontal bars ordered by population, with a customized axis label and formatted tick values that convert large numbers to abbreviated forms (e.g., "B" for billions). The visualization is built with D3 v5, using `scaleLinear`, `scaleBand`, `axisBottom`, and `axisLeft`, while removing default axis domain lines and styling tick text. Population values are multiplied by 1000 after loading from a CSV file.