This example shows a bubble chart that visualizes spatial data by mapping x and y coordinates to a scatterplot and a third size value to the radius of each circle. The chart loads CSV data from a GitHub repository using D3 v5’s `d3.csv` method, then renders the bubbles as SVG circles with a skyblue fill and semi-transparent opacity. It uses `d3.scaleLinear` for the x, y, and radius scales, and displays axes via `d3.axisBottom` and `d3.axisLeft`, with explicit axis labels. The SVG canvas is fixed at 800 by 600 pixels with defined margins.