This example demonstrates how color and size legends can be created using D3.js v6, displaying three categorical items (apple, lemon, lime) mapped to distinct colors. It shows two legends: one for color encoding using a categorical color scale and another for size representation through circle radius. The implementation uses a custom `colorLegend` function that leverages D3's selection API with `selectAll`, `enter`, `merge`, and `exit` patterns to manage SVG groups of circles and text labels. The legend items are vertically spaced and annotated with text labels, with the entire SVG rendered using vector graphics.