Vega's own
This page only varies five properties. Vega documents every mark and every property it has, with a live example on each page, and its gallery is where the corpus this renderer is tested against comes from.
Pick a mark, tick the properties, and see what each renderer does with them. Everything here is drawn from a plain Vega spec, shown at the bottom.
This page only varies five properties. Vega documents every mark and every property it has, with a live example on each page, and its gallery is where the corpus this renderer is tested against comes from.