This fork demonstrates a React & D3 bar chart showing the frequency distribution of letters in a dataset, with hover and click interactions that highlight selected bars. The visualization uses React 19 with hooks for state management and container dimensions via ResizeObserver, while D3 v7 handles scales, axes, and SVG rendering. The code creates a bar chart from CSV data, featuring gridlines, axis labels, and smooth color transitions for interactivity. The example shows a modular approach where D3 handles DOM manipulation within rendered SVG elements while React manages the component lifecycle and state updates.