Fork of Circles with D3
This example creates a dynamic SVG visualization of seven colored circles positioned across a light green background. Using D3 v7's data binding and the general update pattern, the code leverages `select`, `selectAll`, and `join` to render circle elements with properties from an array of objects, assigning each circle's `cx`, `cy`, `r`, `fill`, and `opacity` attributes. The visualization demonstrates how D3's method chaining and data-driven document manipulation enable straightforward creation of styled SVG graphics.