This example shows a pie chart where each slice represents one named CSS color, loaded from a CSV file via `d3.csv`. The chart uses `d3.pie` to compute angles and `d3.arc` to generate SVG path strings, with each slice filled by its corresponding RGB hex value from the data. React manages the component state and renders the SVG, while D3 v7 handles the data loading and layout calculations, creating a colorful full-circle visualization of all named colors.