node { shape: point; }
[ A ]
-> [ B ] { point-style: square; }
-> [ C ] { point-style: dot; }
-> [ D ] { point-style: circle; }
-> [ E ] { point-style: diamond; }
-> [ F ] { point-style: cross; }
-> [ G ] { shape: invisible; }
-> [ H ] { point-style: star; }