[omra]

The URL in the location bar seems to update with the steps you've done (here's one showing the first construction: http://www.sciencevsmagic.net/geo/#0A1.1L0.1A0.3L0.3L1). Undo/Redo can then give an animation like appearance.

[pleion]

You can actually press reset and then redo, redo, redo to replay construction without having to undo first.