This example illustrates fundamental SVG rendering by generating a grid of vertical rectangles that stretch across the full height of the browser window. The code creates 100 rectangle elements using the Document Object Model’s `createElementNS` method with the SVG namespace, setting each rectangle’s x-coordinate and width via attributes. It leverages vanilla JavaScript to dynamically append these shapes to an SVG container that is sized to match the viewport using `window.innerWidth` and `window.innerHeight`. The result is a simple, repeating pattern that demonstrates basic SVG shape creation without external libraries.