This example displays a grid of fifty small, green rounded squares that are added directly to the page body. The code uses plain HTML and CSS for styling, while a simple JavaScript `for` loop with `document.createElement` and `document.body.append` generates the squares. Each square is a fixed-size `div` element, and the layout wraps them using CSS `flex-wrap`. No external libraries or data sources are used; the visualization is purely a procedural arrangement of styled elements.