Circles with D3 + Zoom
This example demonstrates how to create and interact with circles using D3.js. It renders a collection of colored circles with varied positions, radii, and fill colors on a light green SVG background, set at 70% opacity to show overlaps. The visualization implements zooming through d3.zoom, allowing users to scale the content between 0.5x and 5x magnification by adjusting a transform on a group element. The code uses d3.select and data joins to bind circle data to SVG elements, with attributes set via method chaining.