Testes D3
This example uses D3 v6 within a React project to render a simple bar chart of population data from a CSV file. It loads data.csv with `d3.csv`, converts population values to numbers, and draws SVG rectangles using `scaleLinear` and `max` to map population counts to bar widths. The bars are appended to an SVG element, with fixed heights of 300 pixels, and the chart is rendered without axes or labels, showing only the proportional widths of the five countries.