Fork of Viz Function Concept
This example demonstrates the "viz function" concept, a refactored pattern for encapsulating configurable visualization logic. The code renders a single gray inner rectangle within an SVG canvas, with margins and dimensions passed as parameters to a reusable `viz` function. Using D3.js `select` and `join`, the example shows how to structure a visualization with a clean separation between setup and rendering, making the logic adaptable and reusable. The `viz.js` module defines the core drawing behavior, while `index.js` supplies the configuration values.