Fork of Circles with D3
This example demonstrates how to create and dynamically style SVG circles using D3.js. It renders a collection of colorful circles, each with distinct positions, sizes, and fill colors, on a light green background. The code uses the D3 General Update Pattern with `selectAll`, `data`, and `join` methods to efficiently manage SVG elements. It leverages the `attr` method to set circle properties like `cx`, `cy`, `r`, and `fill`, and applies a uniform opacity value to all circles.