This example illustrates how adding an `extent()` to the voronoi layout changes the triangulation and link generation. It renders two overlaid sets of Delaunay triangles and links from 100 random points: one set computed without an extent (shown in blue) and another with a clipped extent (shown in yellow and red). The code uses `d3.voronoi()` from d3.v4 with `.triangles()` and `.links()` methods, drawing the polygons, triangles, and links as SVG paths and lines. The visualization highlights the difference in edge behavior near the boundary caused by the extent constraint.