This example creates a full-screen SVG visualization using vanilla JavaScript, without any external libraries. It initializes a rectangular blue shape that spans the height of the viewport, with its width fixed at 10 pixels. The code uses `document.createElementNS` to construct the SVG element and its child rectangle, setting attributes for dimensions and fill color. The visualization demonstrates basic SVG rendering and DOM manipulation within a React framework, though it does not incorporate React components or state management.