[talmand]

It's a nice library but I'm failing to understand the "physics-based" part.

I'm not seeing anything "physics" in the traditional sense; just manipulating the matrix3d in a transform property of an element in real-time to provide difficult or impossible effects with CSS alone.

[aaggarwal]

I think by physics-based, the author means the motion seen in physical world, such as the example shown in the library page in which the animation resembles the motion of a mass-spring damper, its a second order system, by changing the parameters, one can observe under and over damping.

[shred45]

You don't consider motion based on gravitational and spring-mass models to be an application of physics?

[talmand]

Is they code actually performing physics calculations, or is it a good fake? I can fake much of that behavior with animation keyframes and that doesn't make it physics in my mind.

If it is, then I suppose I'll agree it's physics based.