This example demonstrates how D3’s selection and data-join methods can create intersecting horizontal and vertical stripes across the full viewport. Two groups of rectangles, each bound to an array of 100 values via `d3.range`, are drawn with alternating orientations—one set spanning the width, the other the height. Using SVG `mask` elements, two circular masks are applied: one reveals the horizontal stripes inside a white circle on a black background, while the other does the reverse for vertical stripes. The result is a cross-hatched pattern visible only within the defined circular regions.