A grid of 100 horizontal and 100 vertical striped rectangles is clipped by two inverted circular masks, revealing a crosshatched pattern within a central circle against a solid background. Built with D3 v6, the example uses `select`, `range`, and `join` to generate `<rect>` elements in SVG. Two masks—one with a black background and white circle, the other inverted—apply opposite clipping to the line groups, creating the visual effect.