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>new concept called pinning introduced instead of styling

It's just a scene graph.

Pinning is about positioning variables, not graph structure.

A scene graph is a scene graph is a scene graph. Whatever you call it.

Also, it looks like the pinwheel demo has an error. I suggest you add one of the more advanced demos along with source code on the intro page. Just looking at the first few demos I felt it reimplemented stuff that's already possible with CSS, but it looks like it's capable of much more (the last few demos)

Yes, a scene graph is a scene graph but by pinning I meant "how" the positioning is "described", not the fact that it is positioned.

The game O! is open source. Everything is almost possible with HTML/CSS too, the point is performance across different devices.

Thanks, found and corrected the error.

I couldn't understand exactly how it is supposed to work. Is it about defining anchor points in both parent and child (what you call "align" and "handle"), and then an offset from that?

Exactly! Plus scale/skew and rotation.

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