This example demonstrates how SVG mask elements create intersecting visual patterns from horizontal and vertical stripes. The code uses raw SVG APIs—`document.createElementNS`—to build a full-window canvas with 100 horizontal rectangles masked by a white circle and 100 vertical rectangles masked by a complementary mask. Each mask combines a solid fill with a central circle, revealing or hiding stripes to form a cross-shaped overlap at the center. The result layers two sets of lines that visually blend through the transparent mask regions.