A minimal SVG canvas fills the browser window with 100 thin horizontal rectangles, all clipped by a circular mask that leaves only the ring of the circle visible. The page uses D3's `select` and `range` to generate and append rectangles with programmatic `y` offsets and a full-width `width`, while an SVG `<mask>` element paints black to hide the interior. This results in a simple black-on-transparent ring effect centered on the viewport.