This example displays a grid of horizontal and vertical stripes overlaid with all D3 symbols. The code generates two sets of 100 rectangles each, using D3’s `range` and `selectAll` with `join` to create the stripes, and applies two SVG masks to reveal the symbols through the grid. Each mask is built by iterating over D3’s `symbols` array and rendering each symbol using the `symbol()` API, with the second mask inverted to create a contrasting overlay effect.