That article is about rotating 2-D shapes on the z-axis (3-D plane).
An image of a cube in an HTML document will look like 3D without any transforms applied. However if you try to rotate that image on the Z-axis, it will warp, clearly showing that it is still a 2D object. There are other necessary aspects of 3D such as camera angles and dynamic light and shadows, but that's outside the scope of what you'd expect to be supported in the official CSS spec.
HTML and CSS don't support 3D shape manipulation and motion. WebGL is needed for that.
An image of a cube in an HTML document will look like 3D without any transforms applied. However if you try to rotate that image on the Z-axis, it will warp, clearly showing that it is still a 2D object. There are other necessary aspects of 3D such as camera angles and dynamic light and shadows, but that's outside the scope of what you'd expect to be supported in the official CSS spec.
HTML and CSS don't support 3D shape manipulation and motion. WebGL is needed for that.