This example renders horizontal and vertical alternating stripes masked by two circles in the center of an SVG canvas. The code uses raw SVG manipulation via `document.createElementNS` to construct masks, rectangles, and elements, with `d3` available as a dependency but not actively used. The first mask reveals horizontal stripes, while the second mask inverts the circle to show vertical stripes outside it, creating a crosshatched visual pattern that fills the viewport. The visualization demonstrates layered SVG masking techniques without data input.