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This example creates an interactive SVG visualization by generating a series of horizontal stripes across the full canvas, with a circular mask applied to reveal only the central region. The code uses the raw SVG DOM API (`document.createElementNS`) to construct a mask element containing a white circle over a black rectangle, then appends 100 overlapping rectangular bands that reference this mask via `url(#circle-mask)`. The visualization employs React as the framework but relies on vanilla JavaScript for rendering, with the page adaptively sized to `innerWidth` and `innerHeight`. The result is a simple pattern of layered color bands emerging through a circular window.