This bar chart visualizes breast cancer data, comparing two numeric attributes—perimeter_mean on the x-axis and radius_mean on the y-axis—across individual records. The chart uses D3 v7 to fetch a CSV dataset from a GitHub repository, then renders horizontal bars via SVG rectangles. Scales are created with d3.scaleBand for the categorical x-axis and d3.scaleLinear for the y-axis, while d3.axisBottom and d3.axisLeft generate the corresponding tick marks and labels. The code includes React components for reusable axes and marks, though the primary implementation in index.html directly manipulates the SVG.